About This Event
Set around the scenic Flatensjön lake in Stockholm, this distinctive trail running event transforms a challenging 15-kilometer loop into multiple distance options for runners of varying ambitions. The course delivers nearly 500 meters of elevation gain per lap through beautiful, undulating terrain that mixes technical singletrack with occasional faster sections. What sets this event apart is its unique progression format and the 90K "Grit" challenge that organizers doubt anyone can complete within the 9-hour limit. Beyond the physical races, the event includes a virtual "Brain Race" supporting epilepsy research and a free kids' trail run, making it a comprehensive celebration of trail running for the entire community. Scheduled for early spring, runners can expect a mix of trail conditions as Stockholm transitions from winter to warmer weather, with the course marked by red and white blazes and supported by aid stations throughout.