Stop running your easy days too hard and your hard days too easy. Success at the 100K distance is determined by Physiological Durability and Gastrointestinal Trainability. Targeted at elite athletes pushing their absolute limits, this 26-week plan introduces high-frequency, two-a-day training stress. By pairing hard intervals with recovery runs, and incline running with cross-training and power hikes, we build extreme fatigue resistance and structural durability for the trails. What It ...