Staff Sgt. Corey Terrell, 99th Security Forces Squadron response force member, performs a plank during the second annual occupational and physical therapy open house at the Mike O'Callaghan Federal Medical Center Oct. 29, 2013, at Nellis Air Force Base, Nev. Participants were timed to see who could hold a plank the longest to win a gift card as a prize. (U.S. Air Force photo by Senior Airman Matthew Lancaster)
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