Senior Airman Xavier Navarro, 319th Air Base Wing Public Affairs, stretches prior to competing in the 2014 Shirts’ Push Up-A-Thon held March 26, 2014, at the sports and fitness center at Grand Forks Air Force Base, N.D. Navarro and other competitors made sure to warm up prior to doing push-ups in order to avoid injuries. (U.S. Air Force photo/Staff Sgt. Luis Loza Gutierrez)
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