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U.S. Air Force Chief Master Sgt. Timothy Erdmann performs push-ups during a boot camp challenge on Seymour Johnson Air Force Base, N.C., June 9, 2012. The circuit training challenge involved upper and lower body, including abdominal exercises, each lasting one minute. Erdmann, 916th Maintenance Squadron superintendent, is from Menasha, Wis. (U.S. Air Force photo/Airman 1st Class John Nieves Camacho/Released)


Three hours of power

U.S. Air Force Chief Master Sgt. Timothy Erdmann performs push-ups during a boot camp challenge on Seymour Johnson Air Force Base, N.C., June 9, 2012. The circuit training challenge involved upper and lower body, including abdominal exercises, each lasting one minute. Erdmann, 916th Maintenance Squadron superintendent, is from Menasha, Wis. (U.S. Air Force photo/Airman 1st Class John Nieves Camacho/Released)

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