. If you’re running more than 16 miles, use the same formula, but only run the final three to four miles at marathon goal pace.Hills + 800sImprove form and fitnessCombining a hilly route with half-mile repeats elevates your heart rate, which boosts your
week: 9 weeksRunning 5+ days a week: 8 weeksHalf-marathonRunning 2 days a week: 18 weeksRunning 3 days a week: 16 weeksRunning 4 days a week: 14 weeksRunning 5+ days a week: 12 weeksMarathonRunning 2 days a week: Not advisableRunning 3 days a week: 22
