![]() When you bend your elbow and curl the weight up, that’s the concentric portion. The same can apply to a biceps curl, if you add a hold to the move. In between that, when you stop and pause at the bottom? That’s the isometric phase. And when you push the weight back and your muscles contract, you’re in the concentric phrase. For example, in a squat, when you lower the weight down and your muscles lengthen, you’re in the eccentric phase. Nelson, Ph.D., CSCS, a Minnesota-based exercise physiologist, tells SELF. “People forget that there’s an isometric action in almost every exercise,” Mike T.
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