Optimal Marathon Training Long Run Distance

Running 20 miles plus or minus two miles is a suitable distance for marathon training. It is not necessary to complete the full marathon distance during training. Some athletes may benefit from longer runs, such as 30 miles or even a 50K, but it is not mandatory. High-level professionals often cap their long runs at 18 to 22 miles based on individual needs and goals. Tailoring the long run distance between 18 to 22 miles is ideal, with considerations for an athlete's physical and mental well-being.