U.S. Army 1st Lt. Amy Tang, U.S. Army Physical Fitness School Mobile Training Team 6 leader, performs v-ups during a group physical training session at Fort Eustis, Va., April 22, 2014. Mobile training teams from the USAPFS travel to various installations to train drill sergeants, Advanced Individual Training platoon sergeants and other cadre to conduct PRT activities. (U.S. Air Force photo by Senior Airman Teresa J.C. Aber/Released)