坐在地板上，向前伸直腿，脚趾朝向天花板。
Sit on the floor with your legs straight out in front of you, toes pointed toward the ceiling.
要找到你最合适的鞋跟高度，首先脱下你的鞋子，坐在椅子上，并向前伸直一条腿。
To find your perfect heel height, take off your shoes, sit on a chair and extend one leg straight in front of you.
延伸手臂向前，保持手肘伸直。
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