The Plank Workout That Will Tone Your Abs, Sculpt Your Tush, and Strengthen Your…
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We don't like to play favorites, but...for planks, we'll make an exception. "They are, without a doubt, the best core exercise there is," says trainer David Kirsch, who works with Kate Upton and Liv Tyler. The harder-than-they-look poses in this workout take it up another notch. Adding movement—like... Source
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