Chances are, you’ve heard friends, media, and the medical community spew some running “facts” over the years. Running is great for weight loss. Running will ruin your knees. Running will make you too skinny.

It’s not always easy to determine fact from “common belief” so we’ll dispel these running myths with the researched facts, courtesy of a chapter excerpted from the new book, Run Your Fat Off, by Jason R. Karp, Ph.D. (Reader’s Digest, March 2017).