Two-person teams participating in the base’s Amazing Race event perform 100 push ups and 100 sit ups as one of the seven challenges they had to complete before receiving a clue to the next location and challenge at Ellsworth Air Force Base, S.D., April 13, 2012. Twenty teams raced across a three-mile course to complete clues and challenges. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)