Grenland Hinderløp is an obstacle race held at Jarsengveien 150 in Skien, Vestfold og Telemark, offering 4 km and 8 km distances. The event is scheduled for September, but the date is marked as estimated by the calendar source. This event differs from typical road or trail races; its focus is on navigating obstacles by crawling under and over them, balancing, carrying items, and embracing the mud.
The course is designed for completion by average participants. Individuals encountering an obstacle they find too difficult may opt for an alternative task. Participants can compete individually or as a team of three to five people, with teams encouraged to assist each other. This setup suits workplace team building or a fun day with friends, as well as competitive runners seeking a timed challenge.