Air Force Master Sgt. Jason Phillips, 176th Air Defense Squadron air surveillance technician, performs a clean and jerk during an Arctic CrossFit class inside Hangar 5 at Joint Base Elmendorf-Richardson, Alaska, Dec. 15, 2013. Arctic CrossFit provides classes to accommodate individuals with different strength abilities and experience level as well as coaches to help walk through each exercise. (U.S. Air Force photo/Staff Sgt. Sheila deVera)