LANGLEY AIR FORCE BASE, Va. - - Staff Sgt. Cristina Sullivan, 633d Force Support Squadron fitness specialist, leads a group of Airmen in seated trunk twists during the “Back to Basics” class April 26. The eight-week course is designed to help Airmen improve their physical training performance through a rigorous daily workout program.(U.S. Air Force photo/Airman 1st Class Gul Crockett)