打个比方,弹弓可以拉伸3倍,然后弹出来就很厉害。 这个resistance band大概只能拉伸1.5倍,弹回的力量就不大
打个比方,弹弓可以拉伸3倍,然后弹出来就很厉害。 这个resistance band大概只能拉伸1.5倍,弹回的力量就不大
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