By gripping the racquet a four (on a scale of one to ten, ten being the tightest) your hitting arm and shoulder will stay loose and relaxed.

• 在这点, 当网拍正在指向后面的围墙，它一定下降, 如在照片中，向前挥拍之前下降到接触点下一呎来确保网障碍清除。