U.S. Air Force Staff Sgt. Israel Garza, 23d Security Forces Squadron unit trainer, performs “skullcrusher” triceps exercises at Moody Air Force Base, Ga., March 7, 2014. During a deployment to Afghanistan, several improvised explosive device attacks left Garza with severe back pain from his muscles and bones putting pressure on the Sciatic nerve on his left side. (U.S. Air Force photo by Senior Airman Jarrod Grammel/Released)

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Photo by: Senior Airman Jarrod GrammelReleased |  VIRIN: 140513-F-HF135-182.JPG