The purpose of this paper was to consider a basic concept on the footwork for a ground stroke in tennis.
The results were as follows:
1)It could be thought that the footwork for a ground stroke was divided into four different aspects - 1. taking a posture against a coming ball, 2. approaching a ball to strike, 3. before or after striking a ball, 4. returning to the ready position.
2)It could be thought that the footwork in approaching a ball to strike was made up of three parts - two strides at the begining, running in the middle, and the last step. 3)As for the footwork before or after striking a ball, it considered to be important to consider the position of the center of gravity in reference to making coordination and adjusting the timing against a ball the opponent stroke. 4)It considered that the footwork before or after striking a ball had an influence not only on the speed of a ball after striking but also on the course of the ball.
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