If you’re a veteran marathoner and want to fulfill your PR potential, train with Runner’s World, the worldwide authority on training and racing for more than four decades. This training plan is geared for a runner with at least three years of experience, who regularly logs 35 to 40 miles per week and has comfortably completed other marathons and shorter races. Each week features one day of rest and six days of running. That includes hill work, mile repeats, and Yasso 800s, plus race-pace runs and tune-ups to prep you for race day. The mileage starts at 33 miles per week and peaks at 60 miles per week.