U.S. Air Force physical fitness assessment monitors log laps during a one and a half mile run at the Bell Fitness Center on Barksdale Air Force Base, La., Mar. 7, 2015. Airmen must complete a one and a half mile run, a minimum number of pushups, and sit-ups in one minute, as well as meet an abdominal circumference measured to pass the bi-annual or annual fitness test. (U.S. Air Force photo by Master Sgt. Jeff Walston/Released)