"Your Body is Your Barbell"

Surely you've run nonstop for 15 minutes before. But have you ever performed 15 minutes of resistance exercise without rest? Try it with these challenging body-weight exercises from trainer Craig Ballantyne, C.S.C.S. "You'll be surprised how hard you can work without a gym," he says. Alternate between the Y squat and the Spider-Man pushup for three sets of each. Then perform the remaining three exercises consecutively (again, without rest), doing three sets of each.

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Courtesy of : http://www.menshealth.com