Members of Peterson Air Force Base, Colo., participate in the Airman 1st Class LeeBernard E. Chavis Memorial Workout on Oct. 16, 2012. Created by Chief Master Sgt. Jason France, out of Hill Air Force Base, Utah, the workout is a CrossFit-style exercise that includes 150 burpees, a one mile run and 150 squat thrusts. (U.S. Air Force photo/Staff Sgt. Christopher Boitz)