Rauma Backyard Ultra is a timed ultra-format race using one 6.7 km loop. Runners begin at 08:00, with a new lap starting each hour. The challenge is straightforward: complete each loop in under 60 minutes, rest with the remaining time, and repeat.
The race permits a maximum of 12 laps, with the last lap commencing at 19:00. Completing all 12 laps means running approximately 80 km over 12 hours. This format focuses on consistent repetition of the same course while managing pace, breaks, nutrition, and fatigue, rather than a single sustained effort.