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A CrossFit participant runs back to the gym after completing a 400-meter sprint during a CrossFit class Nov. 19, 2012, at the Joint Base Charleston, S.C., Fitness Center. CrossFit uses random physical challenges so each workout is varied and high in intensity. (U.S. Air Force photo/ Senior Airman Dennis Sloan)




A CrossFit participant runs back to the gym after completing a 400-meter sprint during a CrossFit class Nov. 19, 2012, at the Joint Base Charleston, S.C., Fitness Center. CrossFit uses random physical challenges so each workout is varied and high in intensity. (U.S. Air Force photo/ Senior Airman Dennis Sloan)

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