One Loop. One Hour. Repeat. The Backyard Ultra is simple to understand but brutal to execute.
The Distance: Runners must complete a 6.706 km (4.167 mile) loop. * The Time: You have exactly one hour to finish the loop. * The Bell: You must be standing in the starting corral when the next hour begins. No late starts are permitted. * The DNF: If you fail to finish a loop within the hour, or fail to report to the starting line on time, you are DNF (Did Not Finish). * The End: The race continues until only one runner remains to complete a solo loop.