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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 ...

Nick Blackmer is a librarian, fact-checker, and researcher with more than 20 years of experience in consumer-facing health and wellness content. Pull-ups are a demanding full-body exercise that ...