Title:23 and 1/2 hours: What is the single best thing we can do for our health? Video Length: 9 Minutes 19 Seconds Description: Great video showcasing the importance of physical activity. Should be of great use to PE Teachers. In this video a Doctor-Professor answers the old question "What is the single best thing we can do for our health" in a completely new way. He thinks physical activity is the best single thing!! Dr. Mike Evans is founder of the Health Design Lab at the Li Ka Shing Knowledge Institute, an Associate Professor of Family Medicine and Public Health at the University of Toronto, and a staff physician at St. Michael's Hospital.