Drill out the center of a bat and replace it with cork, you get a lighter, faster swing.
把球棒的中心挖空，用软木塞来代替，如此一来球棒会变轻，挥棒速度会变快。
Michael: it's got a rope swing off of it, a bat pole and another rope to climb up and down.
迈克尔：有一条可以荡来荡去的绳子，一根柱子和可供上下攀爬的绳子。
Moreover, the use of additional resistance worn on the forearm while swinging a baseball bat did not contribute to further increases in instantaneous bat swing velocity and batted-ball velocity.
纵观这些有助于提高击球速度的因素，力量教练要用具备的科学研究信息去帮助棒球或垒球运动员增强其击球速度制定抗阻训练方案。
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