This intermediate half marathon plan assumes a starting fitness level of easily being able to run 17 miles per week with at least a 6-mile run. It starts off running four days per week and maxes out at 29 miles per week. Level Intermediate Weekly Mileage Progression 17, 18.5, 20, 23, 23, 22, 27, 25.5, 26, 29, 26 Long Run Progression 6, 7, 7, 8, 8, 10, 11, 10, 10.5, 13, 9 Written by Coach Cory Smith