Mathias Antonsen is the head coach at Bodø Jiu Jitsu, running every level of the academy's programme with a clear gi emphasis. The academy itself is partnered with Team Trondheim BJJ, which gives the Bodø room a working technical connection to one of the central Trøndelag programmes — the kind of cross-regional link that keeps a peripheral academy from operating in isolation.
His brown belt anchors a programme that is the central BJJ option for practitioners in the Bodø area and across a significant stretch of Nordland coast. North of Trondheim, the country thins out fast: every academy that exists at all is doing structural work just by staying open.
For Bodø specifically, Antonsen is the person at the front of the class doing that work. He is one of the practitioners holding the upper edge of the Norwegian BJJ map together at the level where it gets hardest to keep a room running year-round.