JUDO/ JU JUSTSU
The principle of "Ju do" is taught in Ju Jutsu. When properly applied, this forces the opponent to lose leverage and position and expend extensive energy while the practitioner conserves his or her own.
Effective and efficient self-defense techniques are based on throwing, joint-locks and grappling. Whatever your size and strength, by using leverage, your opponent's momentum, and the proper body position, you will prevail.