The Intermediate Marathon training plan is a slight increase in mileage from the beginner training plan. While this plan still includes four runs per week, there is a larger focus on the length of long runs and race pace/tempo workouts. This marathon plan is 20-weeks in length. You start with a 6-mile goal race pace run in week 1 and progress to two 20-mile long runs in preparation for the marathon. The gradual increase in distance will have you running farther and feeling more comfortable ...