直球球速如何變快。 - 健身
By Emily
at 2012-02-06T00:00
at 2012-02-06T00:00
Table of Contents
我直球球速都在80上下，下盤要如何變穩，上半身和下半身和手臂在投的時候力量的比例。20點謝謝。
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健身
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By Adele
at 2012-02-07T16:12
at 2012-02-07T16:12
By Poppy
at 2012-02-09T21:20
at 2012-02-09T21:20
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