This 21-day plank challenge will tone your body in no time. Add a few more seconds each week and mix in different variations of the full-body move to amp up the exercise (and your strength!) each week. | Health.com This 21-day plank challenge will tone your body in no time. Add a few more seconds each week and mix in different variations of the full-body move to amp up the exercise (and your strength!) each week. | Health.com

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