U.S. Marines perform the overhead press during an endurance test in an Aerobic Capacity seminar course at Marine Corps Air Ground Combat Center, Twentynine Palms, California, June 22-23, 2021. The 2-day course will teach the Marines a thorough understanding of how to improve their recovery as well as develop their cardiovascular "engine" and muscular stamina. (U.S. Marine Corps photo by Lance Cpl. Colton Brownlee)