Tennis players have to OPEN UP to improve their serve. They have to open themselves physically, psychologically, emotionally. This, for me, is the precursor to improvement: Open up. To do this you need to stand well, engage the arms fully, toss higher to make more time in order to take more time, get the body to flex, swing with gusto, reach for more. Dare to miss. You need Cojones.
为了提高发球,网球运动员要放开自己,身体上,精神上。对我来说这是关键。很好的站姿,充分地运用手臂,更高的抛球为了有更多的准备时间,保持身体的弹性,充满激情的挥拍,更多的生长,不拍失误。要有种