Ivar Formos Minneløp is an autumn trail race held in Nordmarka, focusing on forest running. Participants can select from 17 km, 10 km, or 3 km distances, with a dedicated children's race also available. This makes the event suitable for adults, younger runners, and families, not exclusively for seasoned trail racers.
The 10 km course has been updated, utilizing trails within the marka. It now features rolling, challenging terrain rather than a sharp up-and-down profile. The organizers characterize the race as a rewarding effort amidst Nordmarka's natural setting. A technical running shirt is also a tradition; previous races featured popular shirts, and participants can order a light, comfortable sporty version during registration.