Lars and Torsten Brinkema brothers produce feature doc THRESHOLD. 27 minutes recorded August 2026. Writers are told to write what they know — the same applies to filmmakers. Lars and Torsten Brinkema, two brothers practically raised on skis, produced and directed Threshold, a compelling story of the public life and private struggles of four-time Olympic medalist Jessie Diggins, America’s most celebrated cross country skier. They reflect on the challenges of shooting in freezi