NELLIS AIR FORCE BASE, Nev.-- Lt. Col. Jeff Lewis, a surgeon assigned to the 99th Medical Group, performs a bicycle-crunch exercise with other Airmen during a workout led by fitness trainer Tony Horton at the Nellis Sports Pavilion, Sept. 24. Mr. Horton developed a fitness system which is used by military members from around the world. (U.S. Air Force photo by Senior Airman Brett Clashman/Released)
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