Hard and soft techniques

In martial arts, the terms hard and soft technique denote how forcefully a defender martial artist counters the force of an attack in armed and unarmed combat. In the East Asian martial arts, the corresponding hard technique and soft technique terms are 硬 (Japanese: gō, pinyin: yìng) and 柔 (Japanese: jū, pinyin: róu), hence Goju-ryu (hard-soft school), Shorinji Kempo principles of go-ho ("hard method") and ju-ho ("soft method"), Jujutsu ("art of softness") and Judo ("gentle way").

Regardless of origins and styles, "hard and soft" can be seen as simply firm/unyielding in opposition or complementary to pliant/yielding; each has its application and must be used in its own way, and each makes use of specific principles of timing and biomechanics.

In addition to describing a physical technique applied with minimal force, "soft" also sometimes refers to elements of a discipline which are viewed as less purely physical; for example, martial arts that are said to be "internal styles" are sometimes also known as "soft styles", for their focus on mental techniques or spiritual pursuits.

A hard technique meets force with force, either with a linear, head-on force-blocking technique, or by diagonally cutting the strike with one's force. Although hard techniques require greater strength for successful execution, it is the mechanics of the technique that accomplish the defense. Examples are:

Hard techniques can be used in offense, defense, and counter-offense. They are affected by footwork and skeletal alignment. For the most part, hard techniques are direct. The key point of a hard technique is interrupting the flow of attack: in counter-offense they look to break the attack and in offense they are direct and committed blows or throws. Hard techniques use muscle more than soft techniques.

The goal of the soft technique is deflecting the attacker's force to their disadvantage, with the defender exerting minimal force and requiring minimal strength. With a soft technique, the defender uses the attacker's force and momentum against them, by leading the attack(er) in a direction to where the defender will be advantageously positioned (tai sabaki) and the attacker off balance; a seamless movement then affects the appropriate soft technique. In some styles of martial art like Wing Chun, a series of progressively difficult, two-student training drills, such as pushing hands or sticky hands, teach to exercise the soft-technique(s); hence:

(1) The defender leads the attack by redirecting the attacker's forces against them, or away from the defender — instead of meeting the attack with a block. The mechanics of soft technique defenses usually are circular: Yielding is meeting the force with no resistance, like a projectile glancing off a surface without damaging it. Another example could be: an Aikido check/block to an attacker's arm, which re-directs the incoming energy of the blow.

(2) The soft technique usually is applied when the attacker is off-balance, thus the defender achieves the "maximum efficiency" ideal posited by Kano Jigoro (1860–1938), the founder of judo. The tai chi histories report "a force of four taels being able to move a thousand catties", referring to the principle of Taiji — a moving mass can seem weightless. Soft techniques — throws, armlocks, etc. — might resemble hard martial art techniques, yet are distinct because their application requires minimal force. (see kuzushi)