When I was age 12, I did about 300-500 finger power actions with racket cover on.
当我12岁的时候，我经常用包着拍套的球拍做300- 500次手指的力量练习。
The way to do it I need to explain in action. Wrong training with racket cover on is very dangerous.
但必须说明的是，错误的练习方式是非常危险的。
The way to do it I need to explain in action. Wrong training with racket cover on is very dangerous.
但必须说明的是，错误的练习方式是非常危险的。
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