Plank exercise: How to correctly perform the move and variations to try - Livescience.com

A physical therapist explains the benefits of the plank exercise as well as challenging plank variations to try

There’s a good chance you’ve heard of the plank exercise if you have spent time working out at the gym, or perused fitness magazines or online articles. You may even have gotten down on one of the be… [+9121 chars]

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