U.S. Air Force Airman 1st Class Shanique Cameron, 633rd Force Support Squadron fitness specialist, writes down the number of people currently using cardio equipment on her checklist inside the Shellbank Fitness Center at Langley Air Force Base, Va., Sept. 6, 2012. The checklist is completed several times a day by fitness center staff to track the overall usage of the facility. (U.S. Air Force photo by Staff Sgt. Wesley Farnsworth / Released)