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In addition to extra swings, it helps build muscle memory and provides a great workout for the fast twitch muscle fibers in the forearms and wrists, helping to increase bat speed.
Although there are loads of variables that affect running economy including plenty that you have no control over--such as percentage of slow twitch versus fast twitch muscle fibers as well as the structure of your skeleton--it is widely recognized that training improves economy within your own particular limitations.
In addition, the size of type II or fast twitch muscle fibers, which contract quickly and powerfully but have little endurance, declined by about 6.