This 20-week marathon intermediate training plan prepares for a marathon peak performance with 4 running days/week. Training starts at 31 miles/week and peaks at 45 miles/week. For each run, I provide the exact pace, heart rate, and power range. Simply set up your training zones based on your fitness level with a click of a mouse button. • Upload all workouts to your running watch • Switch plan level, free within 14 days • Free email coach support