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当今的大力发球手,都不再只靠肌肉力量制造发球爆发力了, 而是巧妙地利用离心力使球拍加速产生爆发力。如果想提高发球速度,在背后环行挥拍的技术是增强发爆发力不可少的。发球高手罗迪克可谓是环形挥拍动作示的典范,他的球拍在背后走了个大环形轨迹,从而产生巨大的离心力,胸部成大幅的反弓姿势。需要特别注意的是罗递克的膝部动作和球拍的位置, 随着膝关节的屈伸动作与之同步进行的是环形挥拍动作。也就是从膝关节伸直的一刻是球拍环形轨迹的开始,然后立即开始加速挥动, 由此能够把膝关节屈伸产生的能量传导到球拍的环形挥动中。
Today’s strong serve, are no longer rely solely on muscle power to create explosive power, but clever use of centrifugal force to make the racket accelerate explosive. If you want to improve the speed of the ball, swinging around the back of the ring technology is essential to enhance explosive. Serving master Andy Roddick can be described as a model of ring-shaped swing shows his racket in the back of a large circular trajectory, resulting in a huge centrifugal force, the chest into a substantial anti-bow position. Need to pay special attention to Luo Keke knee action and the position of the racket, with the knee flexion and extension movements are synchronized with the ring swing action. That is, the moment of straight extension from the knee is the beginning of the ring track of the racquet and immediately begins the accelerated swing, which transfers the energy generated by flexion and extension of the knee to the ring-shaped swing of the racquet.