The Purpose of this paper is to study the speed and the accuracy of the ball in the forehand smashing according to the differences of the motion and the four parts of the body such as the waist, found the followings. (1) The trained, compared with th...
The Purpose of this paper is to study the speed and the accuracy of the ball in the forehand smashing according to the differences of the motion and the four parts of the body such as the waist, found the followings. (1) The trained, compared with the untrained, turn the shoulder and the waist rapidly and swing the racket using the wrist just before impact. (2) The speed of the ball reduces in both the trained and the untrained without any twist of the waist. (3) The error increases under the conditions without distortion of the waist in the case of the trained.