One of the best ways to start training the quads to work in the straight-knee position is by sitting on the floor with your legs stretched out straight in front of you.
训练运用股四头肌来伸直腿的最好的方法之一是腿伸直坐在地板上。
An acrobatic feat in which the legs are stretched out straight in opposite directions at right angles to the trunk.
劈叉一种杂技动作，腿向相反的方向伸开，各自与身体直角。
An acrobatic feat in which the legs are stretched out straight in opposite directions at right angles to the trunk.
劈叉一种杂技动作，腿向相反的方向伸开，各自与身体直角。
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