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30 Plank Variations That Will Transform Your Core

Planks are so, so good for you. But they’re also kind of, well, boring. Holding a plank for 30 to 60 seconds means you’ve got nothing but the floor to distract you from that deep burn quaking up through your bod. The burn is a good thing; the boredom is not. Once you’ve nailed the proper plank form (here’s how to do i
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