The Bosu ball, whose name stands for "Both Sides Up," is a unique training tool that lets you work on both stability and instability. Its clever design forces you to engage muscles you might not even ...
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You might have seen it at the gym, that half-inflated dome with a flat base. Looks simple, right? But don't be fooled by its appearance. The BOSU (which stands for "Both Sides Up," meaning you can use ...
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