interesting article from the Wall Street Journal about the actual effect that swinging a weighted bat in the on-deck circle has on your swing at the plate.
Baseball players have used bat doughnuts or other types of weights for many years in order to make their regular bat feel lighter during their at-bat. Doughnuts are not allowed in Little League, and technically neither is the on-deck circle, but players often use two bats or a weighted bat sleeve to warm up.
But scientific testing has proven that swinging a weighted bat in the on-deck circle actually slows down your swing at the plate by activating slow-twitch muscle fibers best used for endurance, not the quick burst of speed needed to hit a fastball.
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