U.S. Air Force Staff Sgt. Cristina Sullivan, 633rd Force Support Squadron Back 2 Basics lead instructor, leads a group of Airmen in an abdominal workout during a B2B class at Langley Air Force Base, Va., Jan. 8, 2015. Sullivan said she has a passion for fitness and loves helping people who want to better themselves. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)