You have a decent idea of what all those funky looking bars are meant for in your gym. But that barrel of chalk? Or that PVC pipe? And what about that huge guy who comes in with wraps on his knees and ...

Those stiff, painful spots can take up to two weeks to go away on their own. Sophie Walster/iStock via Getty Images Plus Imagine you’ve just completed a tough upper-body workout. Your muscles feel a ...

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