A BOSU balance trainer is an unstable platform that’s made from an inflated rubber hemisphere and a rigid sheet of plastic. It looks a lot like a stability ball cut in half.
An acronym for “Both Sides Up,” a BOSU is intended to help its users improve their balance and core strength by providing an unstable surface on which to exercise . Since the ball is closer to the ground and less mobile than a stability ball, it’s considered a little safer .
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