We’re here in the beautiful Chamonix, about to watch UTMB. But what exactly is it and why is it so special? Ultra Trail du Mont Blanc, or UTMB for short, is 174 kilometer ultra Marathon, which is held in Chamonix every year. Widely known as one of the hardest ultra marathons due to the incredible over 10,000 meters of elevation gain. Not only is it one of the hardest ultra marathons, it’s also one of the busiest, with over 2,500 participants lining up at that start line. In order to complete UTMB, you must cross that finish line in under 46 hours and 30 minutes, which has LED to a crazy big DNF rate of around 40%. We’re gonna be here for the next few days to let us know. What do you wanna know about this crazy event?