用我们熟悉的运动,解释发球原理和动作。1挥拍动作像棒球网球的发球动作就像棒球中的投球动作,只不过在棒球投球动作中,运动员是向前发力投球,在发球中是向上发力击球。在练习发球时,你可以用一个网球先模拟棒球向前投掷的动作,然后再把动作改为向上投掷。多练习几次,会对初学者的发球技术入门有很大帮助。从左图中可以发现,两个动作都是先拉开胸肌,然后转肩向前(棒球投球)或向上(网球发球)发力。 With our familiar movement, explain the tees and actions. 1 swing action like a baseball tennis serve as baseball in the pitching action, but in baseball pitching action, the athlete is the forward force pitching, serve in the game is upward force shot. When you practice serving, you can use a tennis ball to simulate a baseball throwing forward, and then change the action to throw up. Practicing several times more, will be of great help to beginners serve technical entry. As you can see from the left, both actions are to pull the pectoral muscles first and then turn the shoulders forward (baseball) or up (tennis).