让一个朋友对着你的膝盖弯曲你的脚。
Have a friend flex your foot, bending it down toward your knee.
当您的脚向前翻转时，保持您的脚踝弯曲可以产生更大的蹬离力量。
Keep your ankle flexed as your foot rolls forward to create more force for push-off.
灵活的设计施工允许的脚弯曲，通过各个岗位。
Flexible design construction allows the feet to flex through all positions.
灵活的设计施工允许的脚弯曲，通过各个岗位。
Flexible design construction allows the feet to flex through all positions.
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