It’s a cool spring day in Denver, and I’m running. Not outside in Washington Park or along the Cherry Creek Trail, two of my occasional routes. No, I’m running at progressively increasing speeds on a treadmill in a windowless room at the Human Performance Lab at the Anschutz Health and Wellness Center, located on the University of Colorado Medical Campus. Dr. Iñigo San Millán, the director of the lab, is my taskmaster this afternoon as I undergo what the lab literature refers to as a comprehensive physiological and metabolic test.
