Commanders, chiefs and first sergeants from across the installation warm up for a physical training session in the Pride Hangar at Ellsworth Air Force Base, S.D., Feb. 17, 2012. Ellsworth leadership epitomized the term “lead by example” by completing a circuit of challenging exercises created and led by a group of physical training leaders from the 28th Medical Group. (U.S. Air Force photo by Airman 1st Class Kate Thornton/Released)