A CrossFitter performs a pistol, or one-legged squat, while others complete pull-ups during the CrossFit Undisclosed workout of the day at the 379th Air Expeditionary Wing in Southwest Asia, Aug. 16, 2013. CrossFit Undisclosed here completes a Hero WOD on the anniversary of the day each Hero was killed. Hero WODs are exceptionally intense, grueling and often lengthy workouts that will push your body to its utmost limit, and each WOD is named for a specific individual who was killed in the line of duty, policemen, firefighters and service members alike. (U.S. Air Force photo/1st Lt. Susan Harrington)