The hardest race in the world was inspired by a jail break 39 years ago

The Barkley Marathons are considered by most to be the one of — if not the — hardest ultramarathon in the world. In the last 20 years, only 14 racers have ever finished. Here's how it started and the man behind it all.

Video courtesy of CNN and Great Big Story.

Follow BI Video: On Twitter