Kwan jyel sul (joint manipulation techniques) are used in almost all martial arts including Tae Kwon Do, Hapkido, Aikido, Jujitsu, etc. For the first time ever Grandmaster Benko teaches the history of kwan jyel sul and the six principles of kwan jyel sul: manipulation of the joints, controlling the muscles, regulating the breathing, restraining the blood, direction of force, and body reaction. Learn to control an assailant with the use of minimum force using kwan jyel sul.