The Ostromecki Duathlon MTB is a sprint-distance run-bike-run event in Ostromecko, taking place on an October sports weekend. The main format consists of a 5 km run, a 20 km mountain bike leg, and a final 2.5 km run.
The event is part of a Polish multisport calendar featuring triathlon, aquathlon, swimrun, and aquabike races. It attracts individuals who enjoy mountain biking and running. The program includes children's events, making it a weekend for local multisport enthusiasts rather than a specialized competition for elite athletes.