留意你的踝关节如何曲伸,小腿肚上的肌肉如何收紧和膝关节如何弯曲。
Notice how your ankles flex, how your calf muscles contract and how your knees bend.
学习通过完全伸展你的大腿来伸展你的膝关节,但不超伸。
Learn to straighten your knees with full extension of your legs but without hyperextension.
这个动作也将帮预防膝关节超伸。
This action will also help prevent hyperextension of your knees.
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