This beginner marathon plan assumes a starting fitness level of easily being able to run 7 miles per week with at least a 3-mile long run. It starts off running three days per week and, by week 5, adds one day of cross-training. It maxes out at 27 miles per week with one 18 miler. Level Beginner Target Marathon Time ~4:00+ Weekly Mileage Progression 7, 8, 10, 14, 15, 17, 18, 15, 21, 23, 25, 20, 26, 27, 27, 23, 18 Long Run Progression 3, 4, 5, 7, 8, 9, 10, 8, 12, 14, 15, 12, 16, 16, 18, ...