U.S. Air Force Staff Sgt. Christopher Caplinger, 633rd Force Support Squadron fitness specialist, demonstrates an exercise during Back to Basics at Joint Base Langley-Eustis, Va., Jan. 14, 2014. The class focuses on three major components of the physical training test: sit-ups, push-ups, and the cardiovascular component. (U.S. Air Force photo by Staff Sgt. Stephanie R. Plichta/Released)