This 100-mile ultra training plan is designed to prepare runners for the grueling demands of ultra-distance racing. It emphasizes a combination of long back-to-back runs, structured speed work, hill training, tempo runs, and steady-state efforts. Moreover, I encourage training on a terrain similar to the race course to acclimate the body to the specific challenges of the event. Additionally, the plan incorporates racing shorter distances, such as a 50K and a 50-mile race, to provide valuable experience in handling race-day logistics, gear, hydration, and nutrition.