Portrait Personality: Senior Airman Terrence Ruffin strains for an extra repetition on a weight machine at the fitness center at Eglin Air Force Base, Fla., Jan. 23, 2015. In November, the airman became the youngest professional bodybuilder on the circuit at age 21. Ruffin is assigned to the 16th Electronic Warfare Squadron. Air Force photo by Tech Sgt. Samuel King Jr.