There are ultra-marathons across the Sahara Desert, Antarctica, and other extreme conditions but one of the toughest in the world is the Barkley Marathon in the USA in the state of Tennessee. After 37 years only it has only been successfully completed 21 times by 17 runners. The documentary team at Pilot Field made this great documentary of the 2023 event. #running #marathon #UltraMarathon #BarkleyMarathon youtu.be/IEIerVw1vsw?si=SqUK3R…