On October 17, teams from 74 countries will start the Big’s Backyard Ultra World Team Championship. The event, held every two years, has no set distance or finish line. Runners complete 4.167-mile loops every hour, with leftover time for rest.

Each team consists of 15 runners, and their combined yards determine the national score. The race continues until the last runner stops. Belgium won the first championship in 2020, and the U.S. won in 2022. Belgium reclaimed the title in 2024. Read more culture coverage.

This year, Belgium’s team includes top runners like Ivo Steyaert and Merijn Geerts. The U.S. team features Harvey Lewis and Jon Noll. Australia’s roster does not include the world-record holder, Phil Gore, due to injury. Related: Des Linden Returns to Chicago Marathon for 100-Mile Race Preparation.

This original Runner World brief is based on reporting from Marathon Handbook. Visit the source for its complete reporting, context and any later corrections.