This trail marathon training plan is best for an athlete that has advanced experience with running. Examples could be experience in racing a half marathon or 25k distance. This plan is written to build speed and endurance in preparation for a dedicated racing effort. This plan will start with weekly milage of 30 miles across five days of training per week, with an 8 mile first long run. The plan will top out with a 64 mile 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.