This advanced half marathon plan assumes a starting fitness level of easily being able to run 28 miles per week with at least an 8-mile run. It starts off running five days per week and maxes out at 39 miles per week. Level Advanced Weekly Mileage Progression 28, 31, 30.5, 33.5, 36, 29, 38, 35, 39, 37, 33 Long Run Progression 8, 9, 8, 10, 12, 11, 13, 10, 14, 12, 8 Written by Coach Cory Smith