Start in the high plank (push up) position. As you lower your body toward the floor, simultaneously lift your right foot off of the floor and bring your right knee out and toward your elbow. As you ...
Celebrity trainer David Kirsch shares how to do the super-challenging move he has famous clients like J.Lo, Kate Upton and Heidi Klum do to tone their core, arms, and chest. “This is a pretty ...
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