Seiryoku zen'yo

Achieving maximum effect with minimum effort requires just the right amount of force to be exerted to accomplish the desired results. Too little is not ideal,nor is too much. One common misunderstanding of this principle is that the use of strength or force is always negative. Certainly, misapplication, unnecessary use, or excessive use of strength in a way that wastes energy is not desirable. But considerable strength may be essential,even when applied correctly, against a large or strong apponent of equal skill. Technique will overcome strength or size, but the larger the imbalance in size or strength the greater your skill level will have to be relative to your opponent.