This 16 week training plan is designed to build you up for a strong 50k trail race. You should be running 4-5 days a week prior to starting this plan, with the ability to run for 2 hours comfortably. There are between 2-3 running workouts per week, with additional endurance runs, cross training and strength training. The workout are all written in time and pace based to eliminate the need for a track. The long runs are on Saturdays, with either a mid-distance run or a workout Sunday. The longest run of the training plan is 5 hours, to set you up for a strong finish at any 50k race you choose. Every 4th week is a recovery week and there is a recovery week after the race included in the plan