Senior Airman Terrence Ruffin strains for an extra rep on a weight machine Jan. 23, 2015, at the fitness center on Eglin Air Force Base, Fla. In November 2014, 21-year-old Ruffin won his International Federation of Bodybuilding and Fitness "pro" card at a competition in Miami, becoming the youngest professional bodybuilder on the circuit in 28 years. Ruffin is an avionics Airman with the 16th Electronic Warfare Squadron. (U.S. Air Force photo/Samuel King Jr.)