4 Maintaining the right-knee flex is absolutely crucial. Don ' t straighten the right leg, yet allow the knee to rotate or move slightly sideway at this point.
4 Maintaining the right-knee flex is absolutely crucial. Don ' t straighten the right leg, yet allow the knee to rotate or move slightly sideway at this point.
保持我右膝的弯度是必要的。不要让它伸直，可以让它稍微的旋转或一点侧移。