Capt. Chad Nishizuka, 34th Bomb Squadron chief of weapons and tactics, uses a pulley system to stretch during a physical therapy appointment at Ellsworth Air Force Base, S.D., Oct. 2, 2013. This system allows him to use his healthy arm to stretch his injured shoulder, resulting in a more effective stretch. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)