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Big Dog's Backyard Ultra: The Ultimate Endurance Race

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Out in Bell Buckle, Tennessee, there's a man named Gary Cantrell who brings ultra-marathon runners into his backyard to run in the Big Dog's Backyard Ultra. The rules of the competition are simple. Runners must complete a 4.167-mile loop every hour and the last one standing wins. SI's Jessica Smetana tells the story of athletes who risk massive injuries to win a small gold coin, inscribed with, "I SURVIVED," on the back.