打個比方,彈弓可以拉伸3倍,然後彈出來就很厲害。 這個resistance band大概隻能拉伸1.5倍,彈回的力量就不大
打個比方,彈弓可以拉伸3倍,然後彈出來就很厲害。 這個resistance band大概隻能拉伸1.5倍,彈回的力量就不大
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