The Longbridge 100 Backyard Ultra's

The Longbridge 100 Backyard Ultra is a last-man/woman-standing race staged at Longbridge Farm Barns near Litlington in Alfriston, England. Each loop is 4.2 miles and begins on the hour, with competitors required to be inside the corral when the bell rings, continuing until only one runner remains able to start the next lap. The course uses chalky flint and gravel paths with about 180–190 meters of elevation across winter and summer routes.

Notable features include a Barkley-inspired token system at turnaround, on-site aid and a cafe, eco-friendly operations, and bespoke mementos for finishers, with a maximum of 50 entrants. Visit the organization's website for the most recent information.