It's all about rotational mechanics. When you turn your hands over you're rotating them around their centre point, which is near the middle of your palm.
这是一个力学常识，当你翻转手掌时，手掌是以掌心为中心旋转地。
The Spheres are used by rotating them in the palm of the hand with the fingers.
健身球的使用方法是将球握在手中用手指捻转。
The Spheres are used by rotating them in the palm of the hand with the fingers.
健身球的使用方法是将球握在手中用手指捻转。
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