| 摘要 |
<p>An apparatus (200) for use in the training of an overhead service in tennis comprises a circular indicating means (201) for a target base area (202), feet placement positioning means (204) and an elongate connecting member (206). The positioning means (204) comprises two base plates (220,222) interconnected by a strip (224). The first base plate (220) comprises one indication (226) for the left foot and the second base plate (222) a plurality of indications (228) for the right foot. The distance (249) taken along the connecting member (206) is adjustable. An elastic cord (256) joins a tennis ball (258) to the first plate (220). In everyday use the player will place his feet on the two baseplates (220,222) and will toss the ball high, and then to hit it with the rackett at mid air point called "target point". The target point will be normally located inside an ideal vertical cylinder having for base the "target base" (202). <IMAGE></p> |
