Distances range from 10 km to the marathon, on both roads and trails. Runners can participate in the Ultimate category (all seven stages), the Sport category (the last three stages, comprising a 25.6K trail run, a 10K time trial, and a marathon), and the Guest category (any one of the stages). Seven-person relays are also an option.
This year, I’ve chosen to enter as a Guest (though I can see a future attempt in either the Sport or Ultimate categories). On August 12, I’ll run Stage 3 of the ENDURrun, which is a multi-loop 30K cross-country course. According to the event website, it comprises mostly grass and wood chip paths, mostly through forest trails. It sounds interesting and fun, and will give me a chance to suss out the organization and locale a bit.
Looks like I’ll be putting in some trail and hill training in the next few weeks!