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"  Step 1: Stand with your feet about shoulder-width apart, then jump straight up as high as you can and try to touch your heels to your butt. Step 2: Land with your knees soft, then immediately jump up again. Do 3 sets of 12 jumps. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.seventeen.com/health/fitness/advice/a11205/rock-star-jump/>