Sweetgrass Productions has spent two years creating their latest film, "Valhalla," which will premiere in Denver on Sept. 13. Next week, the latest trailer for the film will come out, but here's a sneak peek at the film -- shot mainly in British Columbia and Alaska -- and what the guys at Sweetgrass have been up to for the past two years. Flyow is a sponsor of the film and you'll see Flylow athlete Paul Kimbrough shredding it up in the movie.