Pushups, traditional part of U.S. Army calisthenics, are a pushover for Corp. Joseph Louis Barrow, front foreground, world’s heavyweight boxing champion. Here, he’s participating in early morning exercises with fellow troopers at the Cavalry Replacement Training Center at Fort Riley, Kansas, July 13, 1942. The champ, member of a horse cavalry training unit is undergoing his basic training. (AP Photo)
