If this exercise is too easy, let your hips go down until your leg is totally flexed, you can also wear a backpack and try again, or just go ahead next step.

  • 如果这个对你来说轻而易举的话,可以试著把屁股坐得更低,直到腿完全弯曲为止,也可以背个背包再练习,或是直接跳到下一个步骤。
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