Stamina is crucial for a long-distance runner because it directly affects their ability to maintain a consistent pace throughout the race. Races can range from 5 kilometers to marathons and beyond, requiring runners to rely on their aerobic capacity and efficiency in energy use. A strong stamina allows runners to endure fatigue, manage their breathing, and recover quickly during races. Training routines often incorporate endurance workouts, interval training, and strength training to help increase overall stamina and performance in long-distance events.