U.S. Air Force Tech. Sgt. Justin Lawson, 20th Component Maintenance Squadron propulsion flight chief and a native of Grand Junction, Colo., works with a biofeedback device to learn how to tighten and brace himself with his abdominal muscles during a physical therapy session at Shaw Air Force Base, S.C., July 23, 2012. This exercise builds core strength to help with his lower back pain. (U.S. Air Force photo by Airman 1st Class Krystal Jeffers/Released)
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