Aiki (martial arts principle)
Aiki (合気, "joining spirit"), a Japanese budō term, at its most basic is a principle that allows a conditioned practitioner to negate or redirect an opponent's power. When applied, the aiki practitioner controls the actions of the attacker with minimal effort and with a distinct absence of muscular tension usually associated with physical effort.
Source: Wikipedia — Aiki (martial arts principle) (CC BY-SA 4.0)