This trail marathon training plan is best for an athlete that has intermediate experience with running and can run at least 8 miles. Examples of experience include races or training runs of the half marathon or 25k distance. This plan will start with weekly milage of 24 miles per week across five days of training per week, with an 8 mile first long run. The plan will top out with 60 miles per week and six days per week of training, with a 20 mile long run. This plan assumes access to trails that offer rolling or hilly terrain.