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A 31-day plank challenge to strengthen your core and boost metabolism

Everyone should be doing planks. Build core strength and master the full-body exercise with this monthly workout plan.

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Ah, the plank. It may just be one of the most intimidating exercises. Anyone who has shook their way through one knows that the isometric exercise appears simple, but is anything but. To the contrary, it is a full-body exercise that recruits muscles from your shoulders to your glutes.

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