Everything you know about running is wrong. At least, that's the view right now according to some of the latest science in fitness and exercise. Think running is bad for your knees, that prescriptive running shoes tailored to your feet help avoid injury? That stretching is good for you before you run? New research is challenging some of our most trusted advice about running and exercise. In this hour of To the Best of Our Knowledge, re-thinking running. Also, the barefoot revolution.