Ultra-trail. A 6.704 km loop to repeat endlessly: follow the formidable Chartreuse Backyard

This Friday, October 31st, at precisely noon, the Chartreuse Backyard 2025 will kick off from Saint-Laurent-du-Pont (Isère). The concept is both simple and incredibly challenging: runners set off every hour. They have one hour to cover 6.704 km, refuel, rest, and so on. The winner is the last competitor remaining. The world record is 110 hours (737.66 km)! Follow this unique event from start to finish with live commentary on our website.