5. Tuttlinger Backyard Ultra

The Tuttlinger Backyard Ultra is a small ultra-distance race in Tuttlingen, using the Backyard Ultra format. Each hour, runners start another 6.706-kilometer loop, continuing until they cannot start or finish the next lap. The Tuttlinger Sportfreunde organize this event, which will hold its fifth edition in late September. The straightforward rule establishes a demanding rhythm: completing a loop quickly grants a brief rest, while a slow finish leaves minimal time before the subsequent start. Performance is gauged by consecutive loops, not a set duration. Previous top efforts have spanned 25 to 32 loops, approximately 167 to 215 kilometers. Past participant numbers have varied from about 30 to 80 runners, and the organizers maintain records, results, and photo archives from prior years.