| 摘要 |
PROBLEM TO BE SOLVED: To exercise volleys mainly, stroke, etc., which are essential to playing tennis at a place with a ceiling at the same height as a general house. SOLUTION: (1) A rubber accumulation part is placed on the ceiling. (2) One end of a rubber string in the accumulation part is suspended via pulleys of the components of the accumulation part, and connected with a ball. This indoor tennis exercise machine is constituted like this.
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