POP-UP-RUNS is a non-profit organization that has been active in Oslo since 2013. The organization focuses on organizing trail runs in the city's surrounding areas, with the aim of making participation available to both experienced runners and beginners. Through their events, they want to create community and joy in nature, while at the same time encouraging participants to explore and appreciate urban nature.
The races are offered in three different routes that stretch over different parts of the field. The variety of trails includes narrow, steep, wide and flat paths, which give participants the opportunity to experience nature experiences such as pine needles, streams, bogs and mushrooms. The organization emphasizes keeping participants active and engaged, and arranges events suitable for all levels of runners.