Jamming - A special method of blocking that crowds or forces an opponent's natural weapon back and against his joint of prevent it from moving or functioning. It can also be accomplished by forcing an opponent's limb against other parts of his anatomy.

Jiu-Jitsu - An oriental form of wrestling known as the "body art". It involves twisting, spraining, dislocating, breaking, and using other like means to the joints and pressure points of the anatomy. Throwing is also an integral part of the art.

Judo - A more gentle form of oriental wrestling. Referred to as the "gentle way" it employs grabs, hip and shoulder throws, in addition to arm or leg locks and holds.

Jump - A maneuvering method which involves moving forward, back, or sideways by vigorously springing or leaping to avoid or execute an attack.