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According to experts, it takes just four exercises to absolutely rip your top half to shreds—so you can start building muscle ...
More gains in less time, with less equipment.
U.S. Air Force Senior Airman Brandon Stout, 380th Expeditionary Civil Engineer Squadron, does pull-ups during a workout at an undisclosed location in Southwest Asia Sept. 11, 2013. (Staff Sgt. Joshua ...