A loop eternal: welcome to the Big Dog Backyard Ultra

It’s a simple conceit – a slightly more than four-mile loop that you run once an hour until all your competitors have dropped out. All very straightforward, until you hear how far the winner ran .... Run a single loop measuring 4.16667 miles within a single hour. Now do it again. And again. Now keep doing it – starting a new loop on the hour, regardless of how fast you finish the previous one – until there’s only one runner willing or capable of doing so. Welcome to