Tech. Sgt. Ed Callahan, 446th Aircraft Maintenance Squadron, McChord Field, Wash., leads a group of fellow Reservists in calisthenics and cardio exercises during a group exercise class at the base track on April 30, 2011. Sergeant Callahan is one of the lead fitness instructors for the newly-formed fitness improvement classes designed to help Reservists prepare for their fitness test. (U.S. Air Force photo/Staff Sgt. Grant Saylor)
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