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Dallas Marathon runners passing by the John Fitzgerald Kennedy Memorial in 2024
Marathon runners at Carlsbad Marathon, US, 2013
Video of human running action

Running is a method of terrestrial locomotion by which humans and other animals move quickly on foot. Running is a gait with an aerial phase in which all feet are above the ground (though there are exceptions).[1] This is in contrast to walking, a slower form of movement where at least one foot is always in contact with the ground, the legs are kept mostly straight, and the center of gravity vaults over the stance leg or legs in an inverted pendulum fashion.[2] A feature of a running body from the viewpoint of spring-mass mechanics is that changes in kinetic and potential energy within a stride co-occur, with energy storage accomplished by springy tendons and passive muscle elasticity.[3] The term "running" can refer to a variety of speeds ranging from jogging to sprinting.

Running in humans is associated with improved health and life expectancy.[4]

It is hypothesized that the ancestors of humankind developed the ability to run for long distances about 2.6 million years ago, probably to hunt animals.[5][6] Competitive running grew out of religious festivals in various areas. Records of competitive racing date back to the Tailteann Games in Ireland between 1171 BCE and 632 BCE,[7][8][9] while the first recorded Olympic Games took place in 776 BCE. Running has been described as the world's most accessible sport.[10]

History

[edit]
See also: History of physical training and fitness
An early 20th Century drawing depicting long-distance runners. It is copied from a Panathenaic amphora from Ancient Greece, circa 333 BCE[11]
A statue of Atalanta the mythical runner who could not be beaten in a race. Produced circa 1703-1705, this statue is a copy of a Roman statue which itself was copied from a Hellenistic original.

It is thought that human running evolved at least four and a half million years ago out of the ability of the ape-like Australopithecus, an early ancestor of humans, to walk upright on two legs.[12]

Early humans most likely developed into endurance runners from the practice of persistence hunting of animals, the activity of following and chasing until a prey is too exhausted to flee, succumbing to "chase myopathy" (Sears 2001), and that human features such as the nuchal ligament, abundant sweat glands, the Achilles tendons, big knee joints and muscular glutei maximi, were changes caused by this type of activity (Bramble & Lieberman 2004, et al.).[13][14][15] The theory as first proposed used comparative physiological evidence and the natural habits of animals when running, indicating the likelihood of this activity as a successful hunting method. Further evidence from observation of modern-day hunting practices also indicated this likelihood (Carrier et al. 1984).[15][16] According to Sears (p. 12) scientific investigation (Walker & Leakey 1993) of the Nariokotome skeleton provided further evidence for the Carrier theory.[17]

Competitive running grew out of religious festivals in various areas such as Greece, Egypt, Asia, and the East African Rift in Africa. The Tailteann Games, an Irish sporting festival in honor of the goddess Tailtiu, dates back to 1829 BCE and is one of the earliest records of competitive running.[18] The origins of the Olympics and Marathon running are shrouded by myth and legend, though the first recorded games took place in 776 BCE.[19] Running in Ancient Greece can be traced back to these games of 776 BCE.

...I suspect that the sun, moon, earth, stars, and heaven, which are still the gods of many barbarians, were the only gods known to the aboriginal Hellenes. Seeing that they were always moving and running, from their running nature they were called gods or runners (Thus, Theontas)...

— Socrates in Plato – Cratylus[20]

The culture of running was not limited to men in Ancient Greece and is demonstrated by the mythical Atalanta. Her suitors were required to beat her in a race or forfeit their lives. As she was unbeatable, all failed except for Hippomenes who was aided by the goddess Venus. He distracted Atalanta during the race by throwing golden apples, given to him by Venus, which she stooped to pick up. The details of the event illuminate the running technique which was considered effective in the contemporary culture.[21] In Metamorphoses the Roman writer Ovid gives Venus's spoken account of the start of the race:

The trumpet sounded the start: The pair, each crouching low, shot forward, skimming the sand with flying feet, so lightly they could run on waves and never wet their sandals, they could run on fields of grain and never bend them. He heard them cheering: Go Hippomenes, lean to the work, use all your strength: go, go, you are sure to win![22]

Such involvement of women in running found concrete representation in the Heraean Games. These were a series of events which took place immediately before the Ancient Olympic Games and which only women could compete in.[23] Writing in the early 20th Century, the historian E. Norman Gardinier states:

At the festival there were races for maidens of various ages. Their course was 500 feet, or one-sixth less than the men's stadium. The maidens ran with their hair down their backs, a short tunic reaching just below the knee, and their right shoulder bare to the breast. The victors received crowns of olive and a share of the heifer sacrificed to Hera. They had, too, the right of setting up their statues in the Heraeum.[24]

Description

[edit]
Eadweard Muybridge photo sequence

Running gait can be divided into two phases regarding the lower extremity: stance and swing.[25][26][27][28] These can be further divided into absorption, propulsion, initial swing, and terminal swing. Due to the continuous nature of running gait, no certain point is assumed to be the beginning. However, for simplicity, it will be assumed that absorption and footstrike mark the beginning of the running cycle in a body already in motion.

Footstrike

[edit]

Footstrike occurs when a plantar portion of the foot makes initial contact with the ground. Common footstrike types include forefoot, midfoot, and heel strike types.[29][30][31] These are characterized by initial contact of the ball of the foot, ball and heel of the foot simultaneously and heel of the foot respectively. During this time, the hip joint is undergoing extension from being in maximal flexion from the previous swing phase. For proper force absorption, the knee joint should be flexed upon the footstrike, and the ankle should be slightly in front of the body.[32] Footstrike begins the absorption phase as forces from initial contact are attenuated throughout the lower extremity. Absorption of forces continues as the body moves from footstrike to midstance due to vertical propulsion from the toe-off during a previous gait cycle.

Midstance

[edit]

Midstance is when the lower extremity limb of focus is in knee flexion directly underneath the trunk, pelvis, and hips. At this point, propulsion begins to occur as the hips undergo hip extension, the knee joint undergoes extension, and the ankle undergoes plantar flexion. Propulsion continues until the leg is extended behind the body and toe-off occurs. This involves a maximal hip extension, knee extension, and plantar flexion for the subject, resulting in the body being pushed forward from this motion, and the ankle/foot leaves the ground as the initial swing begins.

Propulsion phase

[edit]

Research, especially in the footstrike debate, has primarily focused on identifying and preventing injuries during the absorption phases of running. The propulsion phase, which occurs from midstance to toe-off, is crucial for understanding how the body moves forward.[26][27][33]

In a full stride length model, elements of both the terminal swing and footstrike contribute to propulsion.[28][34] The setup for propulsion begins at the end of the terminal swing when the hip joint flexes, allowing the hip extensors to generate force as they accelerate through the maximal range of motion.

As the hip extensors transition from inhibitory to primary muscle movers, the lower extremity moves back towards the ground, aided by the stretch reflex and gravity.[28] The footstrike and absorption phases follow, leading to two possible outcomes.

With a heel strike, this phase may be just a continuation of momentum from the stretch reflex, gravity, and light hip extension, offering little force absorption through the ankle joint.[33][35][36] On the other hand, a mid/forefoot strike helps in shock absorption, supporting plantar flexion from midstance to toe-off.[36][37]

The actual propulsion begins when the lower extremity enters midstance.[33] The hip extensors continue contracting, assisted by gravity and the stretch reflex from maximal hip flexion during the terminal swing. Hip extension pulls the ground underneath the body, propelling the runner forward.

During midstance, the knee should be slightly flexed due to elastic loading from the absorption and footstrike phases, preserving forward momentum.[38][39][40] The ankle joint is in dorsiflexion at this point, either elastically loaded from a mid/forefoot strike or preparing for stand-alone concentric plantar flexion.

The final propulsive movements during toe-off involve all three joints: ankle, knee, and hip.[33][35][36][37] The plantar flexors push off from the ground, returning from dorsiflexion in midstance. This can occur either by releasing the elastic load from an earlier mid/forefoot strike or through concentric contraction from a heel strike.

With a forefoot strike, the ankle and knee joints release their stored elastic energy from the footstrike/absorption phase.[38][39][40] The quadriceps group/knee extensors fully extend the knee, pushing the body off the ground. Simultaneously, the knee flexors and stretch reflex pull the knee back into flexion, initiating the initial swing phase. The hip extensors extend to the maximum, contributing to forces pulling and pushing off the ground, as well as initiating knee flexion and the initial swing phase.

Swing phase

[edit]

Initial swing is the response of both stretch reflexes and concentric movements to the propulsion movements of the body. Hip flexion and knee flexion occur, beginning the return of the limb to the starting position and setting up for another foot strike. The initial swing ends at midswing when the limb is again directly underneath the trunk, pelvis, and hip with the knee joint flexed and hip flexion continuing. Terminal swing then begins as hip flexion continues to the point of activation of the stretch reflex of the hip extensors. The knee begins to extend slightly as it swings to the anterior portion of the body. The foot then makes contact with the ground with a foot strike, completing the running cycle of one side of the lower extremity. Each limb of the lower extremity works opposite to the other. When one side is in toe-off/propulsion, the other hand is in the swing/recovery phase preparing for footstrike.[25][26][27][28] Following toe-off and the beginning of the initial swing of one side, there is a flight phase where neither extremity is in contact with the ground due to the opposite side finishing terminal swing. As the footstrike of the one hand occurs, the initial swing continues. The opposing limbs meet with one in midstance and midswing, beginning the propulsion and terminal swing phases.

Upper extremity function

[edit]
Video of man running

The upper extremity function serves mainly in providing balance in conjunction with the opposing side of the lower extremity.[26] The movement of each leg is paired with the opposite arm, which serves to counterbalance the body, particularly during the stance phase.[33] The arms move most effectively (as seen in elite athletes) with the elbow joint at approximately 90 degrees or less, the hands swinging from the hips up to mid-chest level with the opposite leg, the Humerus moving from being parallel with the trunk to approximately 45 degrees shoulder extension (never passing the trunk in flexion) and with as little movement in the transverse plane as possible.[41] The trunk also rotates in conjunction with arm swing. It mainly serves as a balance point from which the limbs are anchored. Thus trunk motion should remain mostly stable with little motion except for slight rotation, as excessive movement would contribute to transverse motion and wasted energy.

Footstrike debate

[edit]

Recent research into various forms of running has focused on the differences in the potential injury risks and shock absorption capabilities between heel and mid/forefoot footstrikes. It has been shown that heel striking is generally associated with higher rates of injury and impact due to inefficient shock absorption and inefficient biomechanical compensations for these forces.[29] This is due to pressures from a heel strike traveling through bones for shock absorption rather than being absorbed by muscles. Since bones cannot disperse forces easily, the forces are transmitted to other parts of the body, including ligaments, joints, and bones in the rest of the lower extremities up to the lower back.[42] This causes the body to use abnormal compensatory motions in an attempt to avoid serious bone injuries.[43] These compensations include internal rotation of the tibia, knee, and hip joints. Excessive compensation over time has been linked to a higher risk of injuries in those joints and the muscles involved in those motions.[35] Conversely, a mid/forefoot strike has been associated with greater efficiency and lower injury risk due to the triceps surae being used as a lever system to absorb forces with the muscles eccentrically rather than through the bone.[29] Landing with a mid/forefoot strike has also been shown to properly attenuate shock and allow the triceps surae to aid in propulsion via reflexive plantarflexion after stretching to absorb ground contact forces.[34][44] Thus a mid/forefoot strike may aid in propulsion. However, even among elite athletes, there are variations in self-selected footstrike types.[45] This is especially true in longer distance events, where there is a prevalence of heel strikers.[46] There does tend however to be a greater percentage of mid/forefoot striking runners in the elite fields, particularly in the faster racers and the winning individuals or groups.[41] While one could attribute the faster speeds of elite runners compared to recreational runners with similar footstrikes to physiological differences, the hip, and joints have been left out of the equation for proper propulsion. This raises the question of how heel-striking elite distance runners can keep up such high paces with a supposedly inefficient and injurious foot strike technique.

Stride length, hip and knee function

[edit]

Biomechanical factors associated with elite runners include increased hip function, use, and stride length over recreational runners.[41][47] An increase in running speeds causes increased ground reaction forces, and elite distance runners must compensate for this to maintain their pace over long distances.[48] These forces are attenuated through increased stride length via increased hip flexion and extension through decreased ground contact time and more energy being used in propulsion.[48][49][50] With increased propulsion in the horizontal plane, less impact occurs from the decreased force in the vertical plane.[51] Increased hip flexion allows for increased use of the hip extensors through midstance and toe-off, allowing for more force production.[33] The difference even between world-class and national-level 1500-m runners has been associated with more efficient hip joint function.[52] The increase in velocity likely comes from the increased range of motion in hip flexion and extension, allowing for greater acceleration and speed. The hip extensors and extension have been linked to more powerful knee extension during toe-off, contributing to propulsion.[41] Stride length must be appropriately increased with some degree of knee flexion maintained through the terminal swing phases, as excessive knee extension during this phase along with footstrike has been associated with higher impact forces due to braking and an increased prevalence of heel striking.[53] Elite runners tend to exhibit some degree of knee flexion at footstrike and midstance, which first serves to eccentrically absorb impact forces in the quadriceps muscle group.[52][54][55] Secondly it allows for the knee joint to contract concentrically and provides significant aid in propulsion during toe-off as the quadriceps group is capable of producing large amounts of force.[33] Recreational runners have been shown to increase stride length through increased knee extension rather than increased hip flexion, as exhibited by elite runners, which provides an intense braking motion with each step and decreases the rate and efficiency of knee extension during toe-off, slowing down speed.[47] Knee extension, however, contributes to additional stride length and propulsion during toe-off and is seen more frequently in elite runners as well.[41]

Good technique

[edit]
The runner's posture should be upright and slightly tilted forward.

Upright posture and slight forward lean

[edit]

Leaning forward places a runner's center of mass over the front part of the foot, which avoids landing on the heel and facilitates the use of the spring mechanism of the foot. Additionally, it facilitates avoiding the braking effect that occurs when a runner lands their foot in front of the center of mass. Although maintaining an upright posture is crucial, runners should also keep their frame relaxed and engage their core to keep their posture stable. This helps prevent injury as long as the body is neither rigid nor tense. The most common running mistakes are tilting the chin up and scrunching shoulders.[56]

Stride rate and types

[edit]

During running, the speed at which the runner moves may be calculated by multiplying the cadence (steps per minute) by the stride length. Running is often measured in terms of pace,[57] expressed in units of minutes per mile or minutes per kilometer (the inverse of speed, in mph or km/h). Some coaches advocate training at a combination of specific paces related to one's fitness to stimulate various physiological improvements.[58]

Left and right balance

[edit]
See also: Unilateral training

It is common for a runner to have an asymmetric gait pattern which has a dominant side. The leg on this side applies slightly more power than the other leg and has a slightly longer stride length.[59] However, if the dominant leg is excessively stronger than the non-dominant leg, which is excessively weaker, then this can lead to problems with the person’s running technique, reduce efficiency, and increase the risk of injury. It can therefore be advantageous to even up the strength of the legs in order to achieve a more balanced gait overall.[60]

This may be achieved in several ways. The gait can be altered so that the non-dominant leg is used as the dominant leg for a period of time i.e. by making its stride length slightly longer than that of the other leg and by applying the additional power needed to achieve this. The gait can then be periodically alternated so that both legs are used alternatively as the dominant leg. For example, during a run the left leg is used as the dominant leg with a slightly longer stride length than the right. Then, after a period of time, there is a change so that the right leg is used as the dominant leg with a slightly longer stride length than the left. And so forth in a pattern of alternation. This more even use of the legs overall means that any strength imbalances that have developed are reduced.[61] This can also be achieved by running around in a circle, first in one direction and then in the other. This is standardly practiced by runners who use oval running tracks. For example, when running anti-clockwise the inside left stride is shorter and the outside right stride is longer.[62] In order to prevent a large muscle imbalance developing, runners also practice running clockwise so that, conversely, the right inside stride length is shorter and the left longer. This develops both the left and right sides more evenly.[63] Exercises which work the legs in a unilateral manner are also used. Using the legs one at a time, with the same range of movement for each, helps to ensure a more even strength ratio existing between them. For example, doing one legged squats on the left leg, before switching to do them on the right leg, ensures each leg performs the same amount of work and thereby evens up their strength levels.[64] Standardly, higher performance runners have more of an even balance between the relative strengths of their legs.[65][66]

Health benefits

[edit]

Cardiovascular

[edit]

While there exists the potential for injury while running (just as there is in any sport), there are many benefits. Some of these benefits include potential weight loss, improved cardiovascular and respiratory health (reducing the risk of cardiovascular and respiratory diseases), improved cardiovascular fitness, reduced total blood cholesterol, strengthening of bones (and potentially increased bone density), possible strengthening of the immune system and an improved self-esteem and emotional state.[67] Running, like all forms of regular exercise, can effectively slow[68] or reverse[69] the effects of aging. Even people who have already experienced a heart attack are 20% less likely to develop serious heart problems if engaging more frequently in running or any type of aerobic activity.[70]

Although an optimal amount of vigorous aerobic exercise such as running might bring benefits related to lower cardiovascular disease and life extension, an excessive dose (e.g., marathons) might have an opposite effect associated with cardiotoxicity.[71]

Metabolic

[edit]
Further information: Neurobiological effects of physical exercise
A U.S. Army soldier wearing sportswear runs to maintain his fitness.
A woman running in a speedsuit.

Running can assist people in losing weight, staying in shape and improving body composition. Research suggests that the person of average weight will burn approximately 100 calories per mile run.[72] Running increases one's metabolism, even after running; one will continue to burn an increased level of calories for a short time after the run.[73] Different speeds and distances are appropriate for different individual health and fitness levels. For new runners, it takes time to get into shape. The key is consistency and a slow increase in speed and distance.[72] While running, it is best to pay attention to how one's body feels. If a runner is gasping for breath or feels exhausted while running, it may be beneficial to slow down or try a shorter distance for a few weeks. If a runner feels that the pace or distance is no longer challenging, then the runner may want to speed up or run farther.[74]

Mental

[edit]

Running can also have psychological benefits, as many participants in the sport report feeling an elated, euphoric state, often referred to as a "runner's high".[75] Running is frequently recommended as therapy for people with clinical depression and people coping with addiction.[76] A possible benefit may be the enjoyment of nature and scenery, which also improves psychological well-being[77] (see Ecopsychology § Practical benefits).

In animal models, running has been shown to increase the number of newly created neurons within the brain.[78] This finding could have significant implications in aging as well as learning and memory. A recent study published in Cell Metabolism has also linked running with improved memory and learning skills.[79]

Running is a great technique to lower inflammation, stress, anxiety, and depression. People with seasonal affective disorder benefit from running outside in warm, sunny weather. Running can improve mental alertness and sleep.[80] Both research and clinical experience have shown that exercise can be a treatment for serious depression and anxiety even some physicians prescribe exercise to most of their patients.[81] Running can have a longer-lasting effect than anti-depressants.[82] The non-threatening environment offered by running generates a sense of achievement and belonging which helps with mental illness.[83]

Injuries

[edit]
Further information: Running-related injuries

High impact

[edit]
Person with a bad running form. Heel striking and leaning forward are some of the most common mistakes and cause of injuries among beginners.

Many injuries are associated with running because of its high-impact nature. Change in running volume may lead to development of patellofemoral pain syndrome, iliotibial band syndrome, patellar tendinopathy, plica syndrome, and medial tibial stress syndrome. Change in running pace may cause Achilles tendinitis, gastrocnemius injuries, and plantar fasciitis.[84] Repetitive stress on the same tissues without enough time for recovery or running with improper form can lead to many of the above. Runners generally attempt to minimize these injuries by warming up before exercise,[32] focusing on proper running form, performing strength training exercises, eating a well balanced diet, allowing time for recovery, and "icing" (applying ice to sore muscles or taking an ice bath).

Some runners may experience injuries when running on concrete surfaces. The problem with running on concrete is that the body adjusts to this flat surface running, and some of the muscles will become weaker, along with the added impact of running on a harder surface. Therefore, it can be beneficial to change terrain occasionally – such as trail, beach, or grass running. This is more unstable ground and allows the legs to strengthen different muscles. Runners should be wary of twisting their ankles on such terrain. Running downhill also increases knee stress and should, therefore, be avoided. Reducing the frequency and duration can also prevent injury.

Barefoot running has been promoted as a means of reducing running related injuries,[85] but this remains controversial and a majority of professionals advocate the wearing of appropriate shoes as the best method for avoiding injury.[86] However, a study in 2013 concluded that wearing neutral shoes is not associated with increased injuries.[87]

Chafing

[edit]
Chafing of skin following a marathon run

Another common, running-related injury is chafing, caused by repetitive rubbing of one piece of skin against another, or against an article of clothing. One common location for chafe to occur is the runner's upper thighs. The skin feels coarse and develops a rash-like look. A variety of deodorants and special anti-chafing creams are available to treat such problems. Chafe is also likely to occur on the nipple. There are a variety of home remedies that runners use to deal with chafing while running such as band-aids and using grease to reduce friction. Prevention is key which is why form fitting clothes are important.[88]

Iliotibial band syndrome

[edit]

An iliotibial band is a muscle and tendon that is attached to the hip and runs the length of the thigh to attach to the upper part of the tibia, and the band is what helps the knee to bend. This is an injury that is located at the knee and shows symptoms of swelling outside the knee. Iliotibial band syndrome is also known as "runner's knee" or "jogger's knee" because it can be caused by jogging or running. Once pain or swelling is noticeable it is important to put ice on it immediately and it is recommended to rest the knee for better healing.[89] Most knee injuries can be treated by light activity and much rest for the knee. In more serious cases, arthroscopy is the most common to help repair ligaments but severe situations reconstructive surgery would be needed.[90] A survey was taken in 2011 with knee injuries being 22.7% of the most common injuries.[91]

Medial tibial stress syndrome

[edit]

A more known injury is medial tibial stress syndrome (MTSS) which is the accurate name for shin splints. This is caused during running when the muscle is being overused along the front of the lower leg with symptoms that affect 2 to 6 inches of the muscle. Shin splints have sharp, splinter-like pain, that is typically X-rayed by doctors but is not necessary for shin splints to be diagnosed. To help prevent shin splints it is commonly known to stretch before and after a workout session, and also avoid heavy equipment especially during the first couple of workout sessions.[92] Also to help prevent shin splints do not increase the intensity of a workout more than 10% a week.[93] To treat shin splints it is important to rest with the least amount of impact on your legs and apply ice to the area. A survey showed that shin splints make up 12.7% of the most common injuries in running, with blisters being the top percentage at 30.9%.[91]

Events

[edit]
Competitors in the men's 10,000-metre run at the 2012 Summer Olympics.

Running is both a competition and a type of training for sports that have running or endurance components. As a sport, it is split into events divided by distance and sometimes includes permutations such as the obstacles in steeplechase and hurdles. Running races are contests to determine which of the competitors is able to run a certain distance in the shortest time. Today, competitive running events make up the core of the sport of athletics. Events are usually grouped into several classes, each requiring substantially different athletic strengths and involving different tactics, training methods, and types of competitors.

Running competitions have probably existed for most of humanity's history and were a key part of the ancient Olympic Games as well as the modern Olympics. The activity of running went through a period of widespread popularity in the United States during the running boom of the 1970s. Over the next two decades, as many as 25 million Americans were doing some form of running or jogging – accounting for roughly one tenth of the population.[94] Today, road racing is a popular sport among non-professional athletes, who included over 7.7 million people in America alone in 2002.[95]

Limits of speed

[edit]

Footspeed, or sprint speed, is the maximum speed at which a human can run. It is affected by many factors, varies greatly throughout the population, and is important in athletics and many sports. Air resistance for top sprinters can take up to 5% of their energy.[96]

The fastest human footspeed on record is 44.7 km/h (12.4 m/s; 27.8 mph), seen during a 100-meter sprint (average speed between the 60th and the 80th meter) by Usain Bolt.[97]

Speed over increasing distance based on world record times

[edit]
Maximum human speed [km/h] and pace [min/km] per distance
Distance metres Men m/s Women m/s
100 10.44 9.53
200 10.42 9.37
400 9.26 8.44
800 7.92 7.06
1,000 7.58 6.71
1,500 7.28 6.51
1,609 (mile) 7.22 6.36
2,000 7.02 6.15
3,000 6.81 6.17
5,000 6.60 5.87
10,000 track 6.34 5.64
10,000 road 6.23 5.49
15,000 road 6.02 5.38
20,000 track 5.91 5.09
20,000 road 6.02 5.30
21,097 Half marathon 6.02 5.29
21,285 One hour run 5.91 5.14
25,000 track 5.63 4.78
25,000 road 5.80 5.22
30,000 track 5.60 4.72
30,000 road 5.69 5.06
42,195 Marathon 5.69 5.19
90,000 Comrades 4.68 4.23
100,000 4.46 4.24
303,506 24-hour run 3.513 2.82

Types

[edit]
Track
Main article: Track running
A man running with a baton during a relay race.

Track running events are individual or relay events with athletes racing over specified distances on an oval running track. The events are categorized as sprints, middle and long-distance, and hurdling.

Road
Main article: Road running

Road running takes place on a measured course over an established road (as opposed to track and cross country running). These events normally range from distances of 5 kilometers to longer distances such as half marathons and marathons, and they may involve scores of runners or wheelchair entrants.

Cross-country
Main articles: Cross country running, Fell running, and Trail running

Cross country running takes place over the open or rough terrain. The courses used for these events may include grass, mud, woodlands, hills, flat ground and water. It is a popular participatory sport and is one of the events which, along with track and field, road running, and racewalking, makes up the umbrella sport of athletics.

Vertical
Main articles: Fell running, Mountain running, Skyrunning, Trail running, and Tower running

The majority of popular races do not incorporate a significant change in elevation as a key component of a course. There are several, disparate variations that feature significant inclines or declines. These fall into two main groups.

The naturalistic group is based on outdoor racing over geographical features. Among these are the cross country-related sports of fell running (a tradition associated with Northern Europe) and trail running (mainly ultramarathon distances), the running/climbing combination of skyrunning (organised by the International Skyrunning Federation with races across North America, Europe and East Asia) and the mainly trail- and road-centred mountain running (governed by the World Mountain Running Association and based mainly in Europe).

The second variety of vertical running is based on human structures, such as stairs and man-made slopes. The foremost type of this is tower running, which sees athletes compete indoors, running up steps within very tall structures such as the Eiffel Tower or Empire State Building.

Distances

[edit]

Sprints

[edit]
Main article: Sprint (running)
International-level women athletes competing in 100 m sprint race at ISTAF Berlin, 2006

Sprints are short running events in athletics and track and field. Races over short distances are among the oldest running competitions. The first 13 editions of the Ancient Olympic Games featured only one event – the stadion race, which was a race from one end of the stadium to the other.[98] There are three sprinting events which are currently held at the Olympics and outdoor World Championships: the 100 metres, 200 metres, and 400 metres. These events have their roots in races of imperial measurements which were later altered to metric: the 100 m evolved from the 100-yard dash,[99] the 200 m distances came from the furlong (or 1/8 of a mile),[100] and the 400 m was the successor to the 440-yard dash or quarter-mile race.[101]

At the professional level, sprinters begin the race by assuming a crouching position in the starting blocks before leaning forward and gradually moving into an upright position as the contest progresses and momentum is gained.[102] Athletes remain in the same lane on the running track throughout all sprinting events,[101] with the sole exception of the 400 m indoors. Races up to 100 m are largely focused upon acceleration to an athlete's maximum speed.[102] All sprints beyond this distance increasingly incorporate an element of endurance.[103] Human physiology dictates that a runner's near-top speed cannot be maintained for more than thirty seconds or so as lactic acid builds up, and leg muscles begin to be deprived of oxygen.[101]

The 60 metres is a common indoor event and it an indoor world championship event. Other less-common events include the 50 metres, 55 metres, 300 metres and 500 metres which are used in some high and collegiate competitions in the United States. The 150 metres, is rarely competed: Pietro Mennea set a world best in 1983,[104] Olympic champions Michael Johnson and Donovan Bailey went head-to-head over the distance in 1997,[105] and Usain Bolt improved Mennea's record in 2009.[104]

Middle distance

[edit]
Main article: Middle-distance running

Middle-distance running events are track races longer than sprints up to 3000 metres. The standard middle distances are the 800 metres, 1500 metres and mile run, although the 3000 metres may also be classified as a middle-distance event.[106] The 880-yard run, or half-mile, was the forebear to the 800 m distance and it has its roots in competitions in the United Kingdom in the 1830s.[107] The 1500 m came about as a result of running three laps of a 500 m track, which was commonplace in continental Europe in the 1900s.[108]

Long distance

[edit]
Main article: Long-distance running

Examples of longer-distance running events are long-distance track races, half marathons, marathons, ultramarathons, and multiday races.

See also

[edit]

References

[edit]

Further reading

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Running

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Running is a fundamental form of locomotion characterized by a in which both feet are off the ground simultaneously during each stride, enabling faster movement than walking through rapid, cyclical lower limb actions. As a popular aerobic , it engages the cardiovascular and musculoskeletal systems, serving both as a means of transportation in evolutionary contexts and a recreational or competitive pursuit in modern society. It is one of the most popular physical activities worldwide, with an estimated 621 million participants as of 2024. Humans have engaged in running for approximately two million years, with skeletal suggesting it originated as a hunting strategy known as , where early hominins pursued prey over long distances until exhaustion. The of running gained widespread popularity in the , particularly during the 1970s jogging boom in the United States and , driven by figures like coach , who founded the world's first jogging club in in 1961; this era transformed running from an elite athletic domain into an accessible activity for health and leisure, emphasizing its simplicity, low cost, and benefits to heart and lung function. Running encompasses diverse types, including sprints (short bursts over 100–400 meters focusing on speed), middle-distance events (800–3000 meters balancing speed and endurance), long-distance track races (5000–10,000 meters), marathons (42.195 kilometers), , cross-country (off-road terrain), and (varied natural paths). Recreational forms such as and further adapt running for fitness, with often starting with run-walk intervals to build tolerance. Regular running confers substantial health benefits even at relatively low volumes and intensities. Running as little as 15 minutes per day is associated with significant reductions in all-cause mortality (approximately 30%) and cardiovascular mortality risk (up to 45%) compared to non-runners, even at low speeds and volumes, corresponding to an estimated increase in life expectancy of approximately 3 years. These mortality risk reductions are comparable to those from longer running sessions, with diminishing returns beyond moderate amounts. Longer sessions (30+ minutes) offer additional advantages, including greater improvements in cardiovascular fitness (VO2 max), endurance, calorie burn for weight management, and potentially greater mental health benefits. Short daily runs are highly effective for general health and longevity, while also reducing risks of chronic conditions like and , enhancing through stress reduction and mood elevation, and supporting weight management via calorie expenditure, with an approximate energy cost of 1 kcal per kilogram of body weight per kilometer run. However, it carries risks such as running-related injuries affecting up to 70% of participants annually, particularly to the knees and lower legs, underscoring the need for proper technique, gradual progression, and recovery strategies.

Overview

Definition and Classification

Running is a dynamic form of bipedal locomotion defined by the presence of a flight phase, during which both feet are simultaneously airborne and not in contact with the ground, in contrast to walking, which maintains a double support phase where at least one foot is always on the ground. This distinction arises from the biomechanical demands of running, which require greater propulsion and energy expenditure to achieve the aerial interval absent in walking. Running is classified in multiple ways, including by intervention and metabolic demands. Natural running refers to or minimalist approaches that minimize external support to promote intrinsic foot , while shod running employs conventional with cushioning and that alters ground reaction forces and . Based on intensity, running divides into aerobic forms, which sustain moderate paces using oxygen-dependent energy production for endurance activities, and anaerobic forms, which involve short, high-intensity efforts relying on oxygen-independent pathways for rapid power output. Fundamental terminology in running includes the stride, representing the complete gait cycle from initial ground contact of one foot to the subsequent contact of the same foot; the step, denoting the interval between contacts of opposite feet; and , measured as the total steps per minute, which influences overall and speed. Evolutionarily, running emerged as a key adaptation in Homo species around 2 million years ago, facilitating persistence hunting strategies where early humans chased prey to exhaustion over extended distances in hot environments, thereby enhancing survival through superior endurance capabilities compared to other mammals.

Role in Daily Life and Sports

Running serves as a fundamental mode of transportation and exercise in everyday life, particularly through active commuting where individuals run to work or school to integrate physical activity into routines. Studies indicate that regular run-commuting enhances cardiometabolic health and physical fitness among employed adults by increasing daily energy expenditure without requiring additional time. In recreational contexts, running provides an accessible form of leisure-time physical activity that reduces the risk of cardiovascular disease mortality, as evidenced by longitudinal data showing lower incidence among those engaging in such pursuits. Additionally, running features prominently in military training programs to build endurance and operational readiness, with physical conditioning protocols emphasizing run-based exercises to prepare personnel for demanding tasks. In emergency situations, such as evasion during combat, running is a critical survival skill taught in programs like Survival, Evasion, Resistance, and Escape (SERE) training, which equips high-risk personnel with techniques for rapid movement and navigation under duress. In sports, running forms the core of numerous disciplines, including events that encompass sprints, middle-distance, and long-distance races on standardized ovals. Cross-country running involves off-road competitions over varied terrain, often in natural settings, while marathons test endurance over 42.195 kilometers on roads, and navigates rugged paths emphasizing adaptability. Within team sports, running is integral to soccer, where players cover extensive high-speed distances—averaging over 10 kilometers per match—to maintain possession and execute plays, directly influencing success. Similarly, in rugby, sprinting and repeated high-intensity runs underpin positional demands, with optimized training enhancing overall match performance and reducing fatigue. Running fosters strong cultural and social dimensions through community organizations like running clubs, which promote group participation to build social bonds, accountability, and motivation among members. Events such as , a weekly 5-kilometer run, exemplify this by creating inclusive gatherings that enhance , reduce isolation, and encourage sustained across diverse demographics. Its accessibility as a low-barrier exercise—no equipment or facilities required—draws underrepresented groups, including women and those from lower socioeconomic backgrounds, by minimizing entry costs and fostering a supportive environment. Briefly, these social integrations contribute to health benefits like improved cardiovascular function, though detailed physiological effects are explored elsewhere. As of 2025, running trends reflect post-COVID adaptations, with virtual races surging in popularity to enable remote participation; surveys show over 57% of runners engaging in such events during the , a format that persists for its flexibility and global connectivity. Participation in organized races has rebounded to or beyond pre-pandemic levels. Concurrently, wearable technologies for tracking runs—such as GPS devices and fitness monitors—dominate trends, topping fitness rankings for their real-time data on metrics like pace and , empowering users to optimize training and monitor progress. These tools, validated for accuracy in step counting and during activities, further integrate running into daily wellness routines.

Biomechanics

Gait Cycle Phases

The running gait cycle is a repetitive sequence of movements that begins with the initial contact of one foot with the ground and ends with the subsequent contact of the same foot, distinguishing running from walking by the inclusion of a flight phase where both feet are airborne. This cycle is divided into two primary phases: stance, during which the foot is in contact with the ground, and swing, during which the limb is airborne and recovering for the next step. Unlike walking, running involves greater vertical displacement of the center of mass and relies on elastic energy storage and return for efficiency. The stance phase comprises approximately 40% of the gait cycle and is subdivided into initial contact, midstance, and toe-off. Initial contact occurs as the foot strikes the ground, with the flexed at about 30-50°, the at 20-40° flexion, and the ankle in slight dorsiflexion (around 5-10°); this phase absorbs impact through eccentric muscle contractions and joint compliance. Midstance follows as the body's advances over the stance foot, with the knee extending to near full and the ankle achieving maximum dorsiflexion (10-15°), facilitating weight transfer and minimal vertical . Toe-off marks the end of stance, where the ankle plantarflexes to 20-30° and the knee begins to flex, generating propulsive forces to launch the body forward. The swing phase occupies about 60% of the cycle and includes , mid-swing, and deceleration subphases, allowing the limb to reposition for the next contact. begins immediately after toe-off, with rapid hip flexion (to 50-60°) and flexion (up to 90° initially), driven by from . Mid-swing features maximum flexion (around 80-100° in distance running) and hip flexion (50-60°), with the foot clearing the ground via dorsiflexion. Deceleration occurs as the hamstrings eccentrically contract to extend the (to 0-10° flexion) and control forward swing, preparing the foot for initial contact with the ankle in neutral to dorsiflexed position. Footstrike variations at initial contact—heelfirst (rearfoot), midfoot, or forefoot—significantly influence biomechanical loading patterns. Rearfoot strike, observed in about 80% of distance runners, involves the heel contacting first with the ankle dorsiflexed, resulting in a distinct initial peak in vertical ground reaction force (up to 2-3 times body weight) and greater knee extensor moments for shock attenuation. Midfoot strike lands the foot relatively flat, distributing forces more evenly across the foot without a pronounced initial impact peak, which moderates loading rates. Forefoot strike, common in sprinting, contacts via the ball of the foot with the ankle plantarflexed (10-20°), elevating peak vertical forces but increasing ankle plantarflexor moments and eccentric work to harness greater elastic energy return from tendons. These patterns alter the distribution of ground reaction forces and joint kinetics, with rearfoot emphasizing knee-level energy absorption and forefoot shifting it to the ankle for enhanced propulsion efficiency. Propulsion during toe-off relies on ground reaction forces, peaking at 2.5-3 times body weight in the vertical and anterior directions, which interact with the plantarflexed ankle and extending and to transfer forward and upward via the stretch-shortening cycle in muscles like the gastrocnemius and gluteals. This phase captures stored in tendons (up to 50% of in efficient runners) during early stance loading. Recovery in the swing phase involves coordinated and flexion powered by residual and hip flexors, with biarticular muscles such as the hamstrings facilitating energy transfer between segments to minimize metabolic cost and prepare the limb for the next cycle. The flight phase, unique to running and lasting 10-30% of the cycle (increasing with speed), occurs between toe-off of one foot and initial contact of the other, allowing both legs to swing freely and contributing to overall stride length.

Joint and Muscle Mechanics

Running involves coordinated actions at the , , and ankle joints, primarily in the , to facilitate and shock absorption during the stance phase. At the joint, flexion occurs during the swing phase to advance the forward, reaching peak angles of approximately 50-60 degrees, while extension dominates the late stance for push-off, contributing to forward . The joint undergoes flexion of up to 80-90 degrees during swing, followed by eccentric control during early stance to absorb impact, then extension to straighten the for efficient force transfer. At the ankle, dorsiflexion positions the foot for ground contact, transitioning to plantarflexion of about 20-25 degrees during late stance, which is crucial for generating the primary propulsive force. Key lower body muscles play distinct roles in force absorption and generation throughout the running cycle. The , including the vastus lateralis and rectus femoris, eccentrically contract during early stance to control flexion and absorb vertical impact forces, then concentrically extend the for . Hamstrings, such as the biceps femoris, assist in hip extension and flexion, decelerating the during swing and contributing to backward pull-off. The drives hip extension during push-off, providing substantial power for forward acceleration, while the calf muscles—gastrocnemius and soleus—undergo eccentric loading to store energy at foot strike before concentrically plantarflexing the ankle to generate upward and forward thrust. These muscles collectively manage the high forces encountered, with the plantarflexors and accounting for the majority of support and contributions. Ground reaction forces (GRFs) in running impose significant demands on the lower extremities, with vertical peaks typically reaching 2-3 times body weight at mid-stance, reflecting the rapid deceleration and of body mass. Anterior-posterior shear forces arise from braking during early stance (up to 0.3-0.5 times body weight forward) and in late stance (similar magnitude backward), influencing joint stability and energy efficiency. These forces vary with speed and foot strike pattern, but generally, the vertical component dominates, requiring robust muscular and tendinous responses to mitigate risk. The exemplifies elastic energy return in running, acting as a spring-like mechanism that enhances efficiency. During early stance, eccentric contraction of the gastrocnemius-soleus complex stretches the tendon, storing approximately 35% of the mechanical energy as elastic strain, which is then released during plantarflexion to recycle power for propulsion—potentially improving by up to 30%. This storage-release cycle reduces the metabolic cost of locomotion by allowing muscles to operate more isometrically rather than through full shortening cycles.

Stride Parameters

Stride length refers to the distance covered in one complete stride, measured from the point where one foot contacts the ground to the next contact of the same foot. At moderate running paces, such as 3 m/s (approximately 10.8 km/h), preferred stride lengths typically range from 2.06 to 2.12 meters, varying slightly with runner stature. This parameter is influenced by leg proportions, with taller individuals generally exhibiting longer strides due to greater limb length. As running speed increases, stride length tends to elongate to contribute to higher velocities, though efficiency is optimized when it aligns with individual rather than forced extension. Cadence, or step rate, measures the number of steps taken per minute and plays a key role in running efficiency. An optimal cadence range of 170-180 steps per minute is associated with reduced expenditure and lower impact forces, particularly for recreational and runners alike. Recreational runners often fall between 150-170 steps per minute, while elites may exceed 180 during races. The interplay between stride length and cadence determines overall speed, expressed by speed = stride length × cadence / 60, where speed is in meters per second, stride length in meters per stride, and cadence in steps per minute (accounting for one stride equating to two steps). Several factors modulate stride parameters beyond baseline . Runner positively correlates with longer strides, while enhances through improved neuromuscular coordination and fitness levels. also affects these metrics, with uneven surfaces like trails prompting shorter strides and higher cadences to maintain stability. At higher velocities, runners naturally adjust by increasing both stride and , though overemphasizing can compromise . Modern measurement of stride parameters relies on advanced technologies as of 2025. GPS-enabled watches provide real-time estimates of stride length and cadence during outdoor runs by integrating positional data with inputs, achieving accuracies within 0.3-3 meters for distance-based calculations. In settings, systems— including marker-based optical setups with sub-millimeter precision and markerless AI-driven video analysis—offer detailed kinematic profiling, while inertial measurement units () enable portable, field-based assessments with angular accuracies of 2-8 degrees. These tools facilitate precise monitoring without restricting natural movement.

Technique

Postural Alignment

Proper postural alignment in running involves maintaining an upright with a slight forward lean initiated from the ankles rather than the , which positions the center of directly over the feet to facilitate efficient and minimize expenditure. This alignment leverages to support forward while preventing unnecessary strain on the lower back and hips. Research indicates that excessive forward lean beyond approximately 4-8 degrees from upright can impair by increasing metabolic costs by up to 8% and elevating reliance on extensor muscles like the . The head should remain in a neutral position, with the directed forward toward the horizon rather than downward, to preserve spinal alignment and overall balance during movement. This forward focus helps avoid neck strain and ensures the ears stay aligned over the shoulders, contributing to a upper body posture. Core engagement, involving the activation of abdominal muscles such as the transversus abdominis and back muscles like the erector spinae, is essential for trunk stability and preventing excessive rotation or slouching. These muscles work in harmony to maintain neutral spinal alignment and optimal load transfer through the kinetic chain, enhancing overall running efficiency. Common postural errors include overstriding, where the foot lands too far ahead of the body, and excessive forward lean from the waist, both of which generate braking forces that increase loading and risk. Overstriding, in particular, extends ground reaction forces and disrupts forward propulsion, often exacerbated by poor or improper trunk tilt. Correcting these through targeted drills, such as maintaining a of 170-180 steps per minute, can reduce these forces and promote sustainable form.

Limb Coordination

Limb coordination in running involves the synchronized, reciprocal movements of the upper and lower extremities to maintain balance, generate momentum, and optimize . The arms and legs alternate in an out-of-phase , with the right swinging forward as the left advances, and vice versa, which counteracts the rotational torques produced by leg motion and stabilizes the . This integration ensures efficient forward progression while minimizing lateral deviations and energy expenditure. Arm swing is driven primarily from the shoulders, with elbows typically flexed at approximately 90 degrees to facilitate a compact, pendulum-like motion that mirrors the opposite 's action. This shoulder-initiated drive provides counterbalance against the lower limbs' , reducing upper body rotation by up to 60% compared to passive or restricted conditions, and contributes to overall metabolic efficiency by lowering energy costs during locomotion. In addition to stability, the arm action aids by enhancing the rhythmic transfer of , as evidenced in sprinting where forceful arm extension correlates with increased horizontal ground reaction forces. Coordinated during the swing phase complement this upper body motion through targeted actions: the flexes to approximately 90 degrees for lift, allowing the to recover backward relative to the and clear the ground effectively. Simultaneously, the ankle undergoes dorsiflexion, positioning the foot upward to prevent toe drag and prepare for efficient initial contact. These movements synchronize with arm swing to form a fluid alternation that supports stride , typically around 180 steps per minute in distance running. The natural of limb coordination relies on this bilateral alternation to conserve , as deviations from reciprocal patterning increase torso oscillations and metabolic demands. While minor left-right asymmetries exist—such as spatiotemporal differences under 4% and kinematic variations of 1-9.7% in healthy runners—these are inherent and do not impair performance unless exceeding thresholds like 10% in moments, at which point targeted retraining may be applied to restore balance.

Balance and Efficiency

Maintaining left-right symmetry in running gait is crucial for balance, as it ensures even distribution of weight and mechanical loading across both limbs, thereby reducing the risk of overuse injuries such as stress fractures and tendinopathies. Asymmetries as small as ±10% can increase peak knee joint moments by up to 20% on the dominant limb and alter ground reaction forces, leading to uneven stress that promotes chronic imbalances. Runners achieve this symmetry through conscious technique refinements, like alternating lead legs in drills, which help prevent compensatory patterns that exacerbate injury vulnerability. Efficiency in running is enhanced by minimizing vertical —the up-and-down bounce of the center of mass—and braking forces at foot strike, while maximizing horizontal propulsion to direct energy forward. Reduced vertical during ground contact correlates with lower locomotory energy costs, explaining up to 28% of variability in , as less energy is wasted on non-propulsive movements. Similarly, lowering braking through a forward-leaning posture and quicker foot placement under the body decreases horizontal deceleration, optimizing oxygen use and speed maintenance. Optimal , around 180 steps per minute, further supports this by promoting smoother transitions that align with these metrics. Rhythmic breathing patterns, synchronized with stride cycles, aid in efficient oxygen uptake by coordinating ventilatory demands with locomotor , potentially reducing the and improving overall economy. Common patterns include a 2:1 —two strides per breath—which aligns with foot strikes to minimize impact stress and enhance stability. This synchronization, known as locomotor-respiratory coupling, has been observed to decrease oxygen consumption in some studies, though benefits vary with training level and intensity. Adapting technique to preserves balance and on varied surfaces, requiring adjustments in posture, stride, and force application. On uphill slopes, runners shorten stride length and increase vertical ground reaction forces to maintain , with longer contact times (around 0.46 seconds). Downhill running involves quicker turnover (typically 180-210 strides per minute or higher on steep descents) and a slight forward lean to control braking, reducing eccentric loading on muscles while keeping strides shorter for stability. For uneven , such as trails with rocks or roots, flexible foot placement and higher stride frequency variability ( >25%) allow for dynamic balance adjustments, preventing falls and optimizing energy use across irregular gradients.

Physiological Impacts

Cardiovascular and Metabolic Effects

Running, as an , significantly enhances cardiovascular function by improving maximal oxygen uptake (), a key measure of aerobic capacity. Regular typically increases by 5-20% in healthy individuals, depending on initial fitness levels, intensity, and duration, with greater gains observed in previously sedentary people through programs involving moderate to high-intensity running. This improvement stems from enhanced oxygen delivery and utilization, allowing runners to sustain higher intensities for longer periods. Even low-volume running, such as 15 minutes per day, provides substantial health benefits, including reduced all-cause and cardiovascular mortality risk (approximately 30% lower all-cause and 45% lower cardiovascular mortality compared to non-runners), even at low volumes and speeds. These mortality risk reductions are comparable to those from longer sessions, with diminishing returns beyond moderate amounts. These reductions correspond to increased life expectancy, with studies estimating that regular runners live approximately 3 years longer than non-runners, and similar benefits observed even with low volumes of running (e.g., 5-15 minutes daily). Endurance athletes and elite runners may experience greater gains, with some studies of exceptional performers (such as sub-four-minute milers) reporting an average of 4.7 years beyond predicted life expectancy and up to 9.2 years in certain subgroups. Claims of 10+ years often derive from biological aging markers, such as telomere length, rather than direct life expectancy measurements; for example, one study found that jogging or running ≥75 minutes per week was associated with a biological aging advantage of about 12 years compared to minimal activity. Longer sessions (30+ minutes) offer additional advantages for improving cardiovascular fitness (), endurance, calorie burn for weight management, and potentially greater mental health benefits, though short daily runs are highly effective for general health and longevity. The heart undergoes notable adaptations to running training, including an increase in —the amount of blood pumped per beat—which rises by up to 50% at maximal workloads, enabling greater without proportional increases in . Consequently, resting decreases, often from around 70 beats per minute (bpm) in sedentary individuals to 50 bpm or lower in trained athletes, reflecting improved myocardial efficiency and parasympathetic tone. These changes reduce cardiovascular strain during exercise and contribute to overall heart health. Metabolically, running induces shifts in energy substrate utilization, promoting greater fat oxidation during low-to-moderate intensities (around 60-65% of ), which spares stores for higher efforts. At higher intensities, depletion accelerates, and lactate accumulation rises, but elevates the —the point at which lactate begins to build up—by 10-20% in trained runners, delaying through improved mitochondrial function and activity. Running's caloric expenditure is remarkably consistent at approximately 100 kcal per mile, largely independent of speed but varying with body weight; for example, a 70 kg (154 lb) person burns about 95-100 kcal per mile, or approximately 1.35-1.43 kcal per kg per mile. A common approximation in metric units is 1 kcal per kg of body weight per km. For instance, an 86 kg person running 4 km burns approximately 340 to 360 calories, with a typical estimate of 344 kcal (86 kg × 4 km × 1 kcal/kg/km). Running or slow jogging burns 600-1000 kcal per hour for a 70-90 kg adult, with higher rates at faster paces; interval running, alternating fast and slow segments, enhances efficiency for fat loss. While short daily runs are highly effective for longevity and general health, longer sessions enable greater total calorie expenditure, aiding in weight management. This efficiency makes running an effective tool for energy balance and .

Musculoskeletal Adaptations

Regular running induces profound long-term adaptations in the musculoskeletal system, enhancing the structural integrity and functional efficiency of bones, muscles, and connective tissues to withstand repetitive impact and support sustained locomotion. These changes occur through mechanotransduction pathways, where mechanical loading signals cellular responses that promote tissue remodeling and strengthening, ultimately improving and injury resilience. Bone remodeling in runners follows Wolff's law, which posits that bone architecture and density adapt to the mechanical stresses imposed upon them, resulting in increased mineralization and cortical thickness in weight-bearing sites. In long-distance runners, this manifests as elevated bone formation markers, such as osteocalcin, without corresponding increases in resorption, leading to higher tibial speed of sound—a proxy for bone strength—compared to sedentary individuals. Femoral bone density also benefits, with regular running helping to maintain bone density and reduce age-related bone loss in adults over 50, with studies of intense exercise showing preservation of 1-2% BMD annually compared to controls. Endurance running promotes selective and fiber-type adaptations in skeletal muscles, particularly emphasizing slow-twitch type I fibers that predominate in runners and support prolonged oxidative . These fibers exhibit modest —typically 10-20% increase in cross-sectional area—alongside enhanced mitochondrial density, improving fatigue resistance during extended efforts. Additionally, eccentric contractions during the landing phase of the cycle drive adaptations in muscle-tendon units, boosting eccentric strength in the and calves by 15-25%, which aids in shock absorption and propulsion efficiency. Tendons, particularly the Achilles and patellar, undergo stiffening in response to chronic loading from running, optimizing storage and recoil. In trained runners, stiffness increases by approximately 20-30%, enabling greater strain energy recovery—up to 40% more than in non-runners—during stretch-shortening cycles, which enhances overall locomotor efficiency. Similarly, the patellar tendon shows comparable adaptations, with recovered contributing to reduced metabolic cost, as stiffer tendons minimize energy dissipation and amplify force transmission from muscles to bones. These structural changes are mediated by hormonal responses, including elevated (GH) and insulin-like growth factor-1 (IGF-1) secretion during and after running sessions, which facilitate tissue repair and anabolic signaling. Acute GH spikes post-endurance exercise stimulate hepatic IGF-1 production, while local muscle IGF-1 isoforms promote satellite cell activation and protein synthesis, supporting long-term musculoskeletal and remodeling.

Psychological Benefits

Running offers significant psychological benefits, particularly in enhancing through mood regulation and emotional resilience. Regular participation in running, even in short sessions of 15 minutes per day, has been shown to alleviate stress by promoting the release of neurochemicals that foster a sense of , with longer sessions potentially providing greater mental health benefits. These effects contribute to improved overall mental states, integrating with broader health outcomes observed in . One key mechanism is the "runner's high," a euphoric state often experienced during or after prolonged running, attributed to the release of endorphins alongside increases in serotonin and dopamine levels. Endorphins act as natural painkillers and mood elevators, reducing perceived exertion and stress during exercise. Serotonin and dopamine elevations further modulate fatigue and enhance reward pathways in the brain, with studies indicating these neurotransmitters rise significantly during aerobic activities like running, leading to decreased tension and improved emotional balance. Although recent research suggests endocannabinoids may also play a role in this euphoria, the combined neurochemical response remains a cornerstone of running's stress-reducing effects. Running has demonstrated efficacy in reducing symptoms of anxiety and depression, often comparable to established therapeutic interventions. Regular , such as running, has been shown to reduce anxiety symptoms, with effects comparable to other interventions in some studies. For depression, running therapy yields remission and response rates akin to , with meta-analyses confirming physical activity's equivalence to in mild-to-moderate cases. These benefits arise from sustained , which not only distracts from negative rumination but also normalizes mood through neuroplastic changes. Cognitive enhancements from running are linked to increased levels of (BDNF), a protein that supports neuronal growth and . Acute and chronic running bouts elevate BDNF, correlating with improved executive function, such as better planning and , in both young and older adults. Memory performance also benefits, with long-term running training shown to boost recall via BDNF-mediated hippocampal adaptations. These gains underscore running's role in preserving cognitive health, particularly through mechanisms that enhance resilience against age-related decline. In terms of motivation, running's structured regimens, which emphasize goal-setting, cultivate resilience and among participants. Runners who set specific, achievable goals during report higher intrinsic and , as these practices reinforce belief in one's capabilities to overcome challenges. This fosters by building adaptive coping strategies, with studies on endurance athletes like runners showing that directly predicts sustained engagement and performance under stress. Overall, these motivational dynamics transform running into a tool for long-term personal growth.

Injuries and Prevention

Common Injury Types

Running injuries are prevalent among participants, with approximately 50% of runners experiencing at least one annually that disrupts or . This rate is notably higher among and runners, who face an injury incidence of up to 17.8 injuries per 1,000 hours of running compared to 7.7 for more experienced recreational runners. These injuries often affect the lower extremities and can range from overuse conditions to acute problems and minor irritations. Overuse injuries commonly develop from repetitive stress on muscles, tendons, and bones during running. , or medial tibial stress syndrome, cause tenderness, soreness, or pain along the inner edge of the shinbone (), often accompanied by mild swelling in the lower leg; the discomfort typically worsens with activity and eases with rest. Iliotibial (IT) band syndrome involves aching or sharp pain on the outer side of the , sometimes extending to the or along the , triggered by repetitive knee flexion during strides. manifests as stabbing pain in the bottom of the foot near the heel, particularly intense with the first steps after rest, such as in the morning, due to of the tissue. Acute issues in runners frequently include stress fractures, Achilles , and (patellofemoral pain syndrome). Stress fractures present as localized tenderness and pain in the affected —often the , metatarsals, or —that intensifies with weight-bearing activity and may include swelling around the site. Achilles starts as a mild ache above the or in the back of the lower after running, progressing to burning pain and stiffness if untreated. causes a dull, aching pain around or behind the kneecap, exacerbated by activities like climbing stairs, squatting, or prolonged sitting, with possible swelling or grinding sensations. Skin-related injuries from running arise primarily from and . Chafing results in red, irritated, raw that feels burning or stinging, commonly affecting areas like the inner thighs, underarms, or where or rubs repeatedly. Blisters form as fluid-filled bubbles on the feet, toes, or heels due to shear forces from ill-fitting shoes or socks, causing , itching, or tenderness that hinders movement.

Causes and Risk Factors

Biomechanical factors play a significant in predisposing runners to by altering load distribution and joint mechanics. Overpronation, characterized by excessive inward rolling of the foot during the gait cycle, generates large torques on the lower extremities, increasing risk particularly in severe cases. Weak muscles, including the abductors and external rotators, contribute to instability and altered alignment, associating with higher rates of lower limb . Sudden increases in training volume, often violating the "10% rule" that recommends limiting weekly mileage progression to no more than 10%, overwhelm tissue capacity and elevate overuse likelihood. External environmental elements further compound injury vulnerability by influencing impact forces and recovery processes. Running on hard surfaces, such as concrete, amplifies ground reaction forces transmitted to bones and joints, heightening stress fracture potential. Improper footwear, including shoes lacking adequate support or cushioning for an individual's foot type, fails to mitigate these forces effectively, thereby increasing lower extremity injury incidence. Poor nutrition, exemplified by low calcium intake, impairs bone mineralization and density, predisposing runners to stress reactions and fractures due to inadequate skeletal resilience. Behavioral patterns among runners often accelerate development through non-adherence to progressive principles and symptom disregard. Rapid progression in intensity or duration mirrors the risks of sudden spikes, pushing tissues beyond safe loading thresholds. Ignoring early signals delays intervention, allowing minor issues to escalate, as identified by runners and coaches as a primary contributor. Demographic variations, such as age and gender, modulate susceptibility; older runners face heightened risks from reduced tissue elasticity. Technique errors, like suboptimal limb coordination, can amplify these biomechanical and behavioral risks. Transitioning to minimalist shoes can increase calf muscle activation, potentially raising strain risks during adaptation phases for novices.

Mitigation Strategies

Mitigation strategies for running injuries emphasize evidence-based approaches that address load, biomechanical factors, and post- care to reduce incidence and promote recovery. These methods focus on modifiable factors such as overuse and poor preparation, drawing from guidelines and clinical trials. principles form the foundation of by managing workload and allowing adaptation. Gradual progression, often following the "10% rule" of increasing weekly mileage or intensity by no more than 10%, minimizes overload on tissues and has been associated with reduced overuse injuries compared to rapid increases. , incorporating low-impact activities like or , diversifies stress on the body and decreases running-specific risk through improved overall fitness without repetitive strain. Incorporating rest days, typically one to two per week, facilitates tissue repair and prevents cumulative fatigue, with studies indicating that runners with scheduled recovery periods experience fewer overuse injuries than those daily. Strength and flexibility training targets key muscle groups to enhance stability and . abductor exercises, such as side-lying lifts or clamshells performed 2-3 times weekly, strengthen the and minimus, improving pelvic control during strides and potentially reducing lower limb risk. Dynamic routines, including swings and walking lunges before runs, increase muscle temperature and joint mobility, lowering acute incidence by activating neuromuscular pathways without the static hold risks associated with pre-run static stretches. Proper equipment selection supports biomechanical alignment and shock absorption. Choosing running shoes based on foot type, , and cushioning needs—such as neutral shoes for low-arch runners—can attenuate impact forces and reduce injury rates by 20-30% by matching terrain and pronation patterns. , custom-molded inserts for overpronators or those with alignment issues, correct foot posture and distribute pressure evenly, potentially decreasing running-related injury rates by 25% through better shock absorption and reduced joint stress. Recovery techniques aid in managing minor injuries and accelerating return to running. The method—rest to avoid aggravation, for 15-20 minutes to reduce swelling, compression with elastic wraps, and above heart level—effectively controls inflammation in acute soft-tissue injuries like sprains, promoting faster healing within 48-72 hours. Foam rolling, a self-myofascial release technique targeting calves, quads, and IT bands for 1-2 minutes per area post-run, alleviates delayed-onset muscle soreness by 20-30% and enhances blood flow for quicker recovery. Professional interventions, such as involving retraining and targeted exercises, address underlying imbalances and have been shown to prevent recurrence in 70-80% of cases when initiated early.

History

Ancient and Prehistoric Running

Running's origins trace back to the evolutionary adaptations of early hominins, where endurance running emerged as a key survival strategy. The posits that humans developed physiological and anatomical traits for sustained locomotion around 2 million years ago, coinciding with the appearance of . These adaptations, including efficient sweat glands for and spring-like tendons in the legs and feet, allowed hominins to outlast quadrupedal prey during in hot environments. involved chasing animals over long distances until they overheated and collapsed, providing a caloric advantage that supported brain growth and tool use in early species. Prehistoric evidence of bipedal locomotion, foundational to running, is preserved in fossil footprints from , , dated to approximately 3.6 million years ago and attributed to . These tracks demonstrate a heel-strike with toe-off propulsion, indicating an upright posture that later enabled running capabilities, though the prints themselves reflect walking rather than sprinting or endurance paces. Such locomotor efficiency distinguished early hominins from other primates, facilitating foraging and evasion in open savannas. In ancient civilizations, running served practical and ceremonial roles. The , dating to around 2600 BCE, featured ritual runs by pharaohs around markers to demonstrate physical vitality and royal power. Egyptian tomb art from (circa 2686–2181 BCE) depicts runners in hunting scenes. The earliest recorded organized running event was the stadion race, a sprint of about 192 meters, introduced at the in 776 BCE in , as part of religious festivals honoring . In , indigenous groups like the maintained ancient traditions of long-distance footraces and . Running held profound cultural significance across societies, often intertwining with rituals, warfare, and governance. In , victories in footraces symbolized heroic prowess and divine favor, with messengers like running marathons to relay battle news, such as the 490 BCE victory at Marathon. Among the (circa 1438–1533 CE), chasquis—elite relay runners—covered up to 240 kilometers daily along the Qhapaq Ñan road network, delivering oral messages, quipus (knotted cords), and goods to maintain imperial control and warn of threats. These roles elevated running to a sacred act, embodying endurance, communal prayer, and strategic mobility in rituals and conflicts.

Evolution in Organized Sports

The formalization of running as an organized sport began in ancient Greece with its inclusion in the Olympic Games, where it served as a cornerstone event emphasizing physical prowess and civic virtue. The earliest recorded Olympic running event was the stadion, a short sprint of approximately 192 meters, introduced in 776 BCE at Olympia. Longer distances followed, including the dolichos, a endurance race spanning about 20 stadia (roughly 3,840 meters), added around 720 BCE to test stamina over extended efforts. These events, held every four years, integrated running into panhellenic festivals, attracting competitors from city-states and establishing rules like barefoot racing on packed earth tracks. The modern revival of organized running occurred with the inaugural in in 1896, inspired by to restore ancient ideals amid 19th-century movements. Running featured prominently, with 12 events across sprints and distances, featuring 63 athletes from 9 nations, primarily from and the . advanced in 1912 with the formation of the International Amateur Athletic Federation (IAAF), now , which unified global rules for , including running, to promote fair competition and amateurism. Women's participation emerged in 1928 at the Amsterdam Olympics, where events like the 100-meter dash debuted, marking a shift from exclusionary policies despite resistance from figures like Coubertin. In the , running's popularity surged, particularly with the marathon's growth following the jogging boom , driven by fitness trends, books like Jim Fixx's The Complete Book of Running, and increased road races that attracted millions of recreational participants. This era saw participation explode, with U.S. road races multiplying from fewer than 100 in 1970 to over 15,000 by 1980, fostering a cultural shift toward running as accessible practice. From the 1980s onward, East African athletes, especially from and , asserted dominance in distance running at major competitions, attributed to high-altitude , cultural emphasis on , and systematic talent development in regions like the . Kenyan runners, for instance, won over 70% of major marathon titles between 1988 and 2000, reshaping global performance standards. By 2025, organized running has emphasized inclusivity and technological integration to broaden participation. In July 2025, World Athletics announced a once-in-a-lifetime SRY gene test for athletes in the female category, effective September 1, 2025, to determine eligibility based on the absence of the Y chromosome while supporting gender-diverse athletes and addressing transgender and DSD inclusion. Concurrently, AI-driven coaching tools have advanced training personalization, with platforms analyzing biomechanics and performance data to optimize plans, as seen in systems like KoopAI that adapt workouts in real-time for elite and amateur runners. These developments reflect running's evolution toward equity and innovation in competitive structures.

Competition

Event Categories

Competitive running events are broadly categorized by format, surface, and purpose, encompassing track-based races, road and off-road competitions, team relays, and non-competitive or emerging variants. These categories reflect the diversity of the sport, from high-speed sprints on synthetic tracks to challenges across varied terrains, governed primarily by organizations like for standardized distances and rules. Track events form the core of competitive running, typically held on a 400-meter oval track and divided into sprints, middle-distance races, and specialized variants like the steeplechase. Sprints cover distances from 100 meters to 400 meters, emphasizing explosive speed and acceleration, with athletes starting from blocks in individual lanes. Middle-distance events range from 800 meters to 3000 meters, requiring a balance of speed and aerobic endurance, often run in lanes initially before merging. The steeplechase, a 3000-meter event, incorporates hurdles and a water pit to simulate cross-country obstacles, adding technical demands to the race. Road and off-road events shift focus to longer distances on paved or natural surfaces, testing sustained pacing and resilience. The marathon, standardized at 42.195 kilometers, is the flagship race, originating from traditions but formalized in modern Olympics. Half-marathons cover exactly half that distance, at 21.0975 kilometers, serving as an accessible entry to running. Cross-country races, held on grass, trails, or uneven terrain, typically span 5 to 10 kilometers for adults, varying by age and promoting adaptability to natural environments. Ultramarathons exceed the marathon length, often starting at 50 kilometers and extending to 100 kilometers or more on roads, trails, or mixed surfaces, regulated by bodies like the International Association of Ultrarunners. Relay and team events emphasize coordination and strategy, where teams pass a baton over fixed distances. The 4x100-meter involves four runners covering 100 meters each on the track, prioritizing seamless handoffs at high speeds. , a long-distance originating in , features teams of 6 to 10 runners covering marathon or greater distances on roads, with each leg ranging from 3 to 20 kilometers, fostering a cultural emphasis on collective effort. Non-competitive running events prioritize participation, , and over elite performance, including fun runs that are short, themed races open to all abilities. Charity events, such as color runs or walks, often support causes like , drawing mass participation without strict timing. Emerging formats like vertical running challenge athletes to ascend stairs in skyscrapers or towers, with races measuring elevation gain—such as 1000 meters vertically—rather than horizontal distance, as seen in series governed by the Vertical World Circuit. Human running speed is biomechanically limited by factors such as muscle force production and ground contact time, with theoretical maximum velocities estimated at around 12 m/s (approximately 43 km/h) based on studies of peak sprint mechanics. The current men's 100 m stands at 9.58 seconds, set by in 2009, equating to an average speed of about 10.44 m/s (37.6 km/h) and a peak speed of 12.42 m/s. This record highlights the proximity to physiological limits, as biomechanical models suggest further improvements may be constrained by the inability to apply maximal muscle force efficiently during ground contact. World record paces in running decline progressively with increasing distance due to the shift from anaerobic to aerobic energy reliance and accumulating fatigue. For instance, the men's 100 m record pace of approximately 37.6 km/h contrasts sharply with the marathon world record pace of about 21 km/h, set by Kelvin Kiptum in 2:00:35 at the 2023 Chicago Marathon. Empirical models of world records confirm this nonlinear decline, with speed dropping more steeply beyond 5 km as oxygen uptake and metabolic efficiency become dominant factors. As of 2025, World Athletics data for elite performances across distances from 100 m to the marathon illustrate this trend, with average paces falling from over 30 km/h in sprints to under 22 km/h in longer events. Several key factors influence running achievements and record progressions. Genetic variations, such as the ACTN3 R577X polymorphism, confer advantages in sprint by promoting fast-twitch muscle function, with the RR genotype overrepresented among power athletes. enhances aerobic capacity by stimulating production and improving oxygen utilization, leading to gains of 1-2% upon return to , as evidenced in studies of runners. Technological advancements in , particularly carbon- plates introduced in "super shoes" since 2019, have boosted by 2-4% through increased energy return and reduced metabolic cost, contributing to multiple record breaks in middle- and long-distance events. Gender disparities in world records have narrowed over the , driven by improved participation and access, with women showing faster relative improvements (2.8% per on average) compared to men (1.3%). For example, the women's marathon of 2:09:56, set by in 2024, represents a 7.8% gap from the men's mark, smaller than historical differences exceeding 15%. Projections based on trends suggest potential parity in select distances like the 5,000 m by 2100, assuming continued physiological and environmental equalization.

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