A Doctor-Professor answers the old question “What is the single best thing we can do for our health” in a completely new way. Watch:

• How active are you?
  Can you limit your sitting and sleeping to 23-1/2 hours a day?

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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.