This plan is built for runners aiming to finish the Mt. Fuji 100 in 37–44 hours. I’ve designed it using a block-style approach that I’ve successfully used with multiple athletes who’ve completed this race. It starts with an Acclimatization block to safely ramp up training, followed by Endurance, VO₂ Max, and Tempo blocks to build the strength, aerobic fitness, and muscular durability needed for the course. A final Taper block ensures you arrive at race day rested and ready. Weekly training demands are included to help your preparation simulate the distance, elevation, and pacing of Mt. Fuji, so you’re physically and mentally prepared for every section of this challenging ultramarathon.