Staff Sgt. Juan S. Ortiz, 94th Civil Engineer Squadron explosive ordnance disposal, performs a single-leg squat as part of the TRX program Mar. 7, 2015 at Dobbins’ Human Performance Center. TRX includes upper and lower-body exercises to simultaneously build body strength, increase flexibility and strengthen core muscles. (U.S. Air Force photo/Senior Airman Andrew J. Park)