U.S. Air Force Senior Airman Jonathan Smith, 633rd Contracting Squadron contracting specialist, pulls a weighted sled in one of the events at the annual Squadron Fitness Challenge at Langley Air Force Base, Va., May 24, 2012. Airmen took part in seven different physically-demanding events during the Squadron Fitness Challenge, held during May Fitness Month. (U.S. Air Force photo by Airman 1st Class Kayla Newman/Released)