Beyond the Plank: 5 Moves For a Stronger Core

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Advanced Side Planks

A side plank is already tricky with your arm extended overhead. But from that position, tap the heel of your top foot in front of you, then behind you. You're creating instability, and your core needs to work hard to correct the imbalance. After doing a few reps of the movement on one side, turn over and repeat it on the other side.

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