Harvey Lewis has won Big Dog’s Backyard Ultra — one of the most impressive athletic accomplishments ever. Here's how it works: Competitors run a 4.16-mile (6.7km) loop every hour over hilly terrain. If they complete their lap in under an hour, they can use the remaining time to eat, drink, sleep, and recover. However, they must begin the next loop at the start of the next hour — and keep repeating this until they can't continue any longer. The race has no set end and finishes when only one person is left able to run, the rest having pulled out through exhaustion injury, or lack of sleep. But here's the craziest part... This year's race went on for 108 hours. That means Harvey Lewis ran 4 miles...every hour...for nearly FIVE STRAIGHT DAYS. • 108 hours of running • 450 miles covered • New World Record At one point he was taking 60-second naps before starting his next lap! That's absolutely insane.