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When a marathon training plan calls for a short run, it is usually less than 8 miles. Even if you feel great, resist the urge to add mileage. The weekly long training run is the important mileage builder in marathon training, and short runs on the other days of the week are part of the recovery process. You won't be any less conditioned if you run 5 miles rather than 10 miles on a random Wednesday when you are running 17 miles on Saturday.