Lt. Col. David Hamilton, physicians assistant, Medical Department Activity, runs on a treadmill while taking the VO2 Max test on the Fitmate Pro, a machine able to measure oxygen consumption, as Mallory Lewis (left), health promotion technician, and Tony Heinz, project lead, both of the Army Wellness Center, administer the test at the Iron Horse Sports and Fitness Center, Fort Carson, March 5, 2013. (U.S. Army photo by Cpl. William Smith, 4th ID PAO)