Ultra running and marathon training share many similarities, but they also have a few distinct differences in their approaches. Ultra running typically requires higher training volume and lower intensity compared to marathons. Ultra runners focus on building endurance through long, slow-distance runs, often doing back-to-back long runs on consecutive days to simulate the demands of ultra distances. In contrast, marathon training usually involves higher-intensity workouts such as tempo runs, interval training, and speed work to improve aerobic capacity and running economy over shorter distances. Due to the different durations, nutrition and hydration strategies also somewhat defer. Ultra runners must learn to fuel and hydrate effectively over several hours or even days of continuous running, often relying on a combination of solid foods, gels, electrolyte drinks, and real-time adjustments based on environmental conditions and individual needs. Marathoners, while also requiring fueling and hydration during the race, typically focus on pre-race carb-loading and on-course hydration. The terrain is worth mentioning, too. Ultra running takes place in diverse and challenging terrain, namely trails, mountains, deserts, and extreme weather conditions. As a result, ultra runners must adapt their training to mimic race-specific terrain and elevation profiles, incorporating hill repeats, trail runs, and altitude training. Conversely, marathons typically occur on flat road courses with predictable surfaces, requiring less emphasis on terrain-specific training and altitude adaptation.