A marathon training plan for someone who is looking to finish the a marathon without a time goal. Before starting this plan you should be able to complete 15-20 miles a week on a regular basis. This plan is designed to build the endurance it will take to cover the 26.2 miles. Plan includes 5 days of run/walking starting with 21 miles a week with a highest weekly mileage of 40. Total mileage over the 20 weeks is 615.