Media relations senior director David Kelly speaks with Iñigo San Millán, a researcher at the CU School of Medicine and trainer of super athletes, including the most recent two-time Tour de France winner. Doctor San Millan uses his work with athletes, including a stint as a cyclist and soccer player himself, to learn more about how our metabolism affects cancer, diabetes and other diseases. He implores exercise is the most powerful medicine in the world, and it holds secrets that are dramatically changing the way we look at physical and mental health