This 20 week, time-based plan is designed for the intermediate runner looking to complete the Grand Rapids Marathon. In order to begin this plan the runner shoulder already be established with running 40 minutes, be able to perform 6 1-minute fast intervals with walking breaks in between, and know their threshold pace. Your threshold pace can be estimated by taking your average pace over an all out 30-minute solo effort. Your threshold pace can be updated in training peaks under your "zones" in the "settings" tab. This will help to ensure that all of your workouts are set up with the proper pacing/intensity. There is a threshold test scheduled in your plan so you will be able to test yourself after a few weeks of the workouts. You can update your pace again in training peaks and then it will recalibrate all future workouts to be based off of this. This plan includes 3 days of running, 2 recommended days of strength training, and 1 day of biking with Sunday as a rest day. It is focused on low intensity/zone 2 pacing and gradually progress long runs on Saturdays. There are fueling and hydration tips in the plan on the running days that are at or exceed 90 minutes. If you wish to have a week day off, this plan can easily be modified to have Friday as a rest day if you perform the light bike ride on Sunday.