How to: Sit on a stability ball with feet hip-width apart on the floor.

如何锻炼：稳坐在一个球上，双照着地，与胯同款。

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How to: Sit on a stability ball with feet hip-width apart on the floor.

如何锻炼：稳坐在一个球上，双照着地，与胯同款。

youdao