If you've finished a marathon, and now want to finish faster, train with Runner's World, which has been recognized as the worldwide authority on training and racing for more than four decades. This 16-week plan is geared for those who have been running for two to three years, have gone through regular cycles of logging up to 30 miles a week, and have finished a few half marathons and at least one marathon. It will help you develop the speed and endurance you need to run your best marathon yet. Each week features two days of rest and five days of running. That includes hill work and the ever-popular Yasso 800s to build leg and lung power, plus marathon-goal pace runs.