A chagi is a technique to overpower the opponent by making use of the foot manipulated by the motion of leg. The chagi can be performed by using the force at the time of extending the bent and folded knee or the flexion force of the extened leg, making use of the body's turning force. The chagi techniques are classified by the motion of leg and foot, and the kicking power diggers according to the applicable parts of the body. There are also other classification methods according to the way of kicking either by holding the opponent or using the impellent force.