Stop running your easy days too hard and your hard days too easy. The 50-Mile distance requires a massive shift in training philosophy. Success is no longer determined strictly by your VO2 Max, but by your Physiological Durability and Gastrointestinal Trainability. Targeted at highly experienced athletes pushing their absolute physiological limits, this 26-week plan represents the sharp end of the 80/20 methodology for ultramarathons. By introducing elite two-a-day training stress—pairing ...