Featuring the proven 80/20 intensity balance described in Matt Fitzgerald's bestselling book 80/20 Running, this Ultra 100 Mile Level 3 training plan will provide you with the same workout structure used by the most successful runners in the world. TARGET ATHLETE This plan is a good fit for experienced competitive runners who are prepared to train 2x a day some days in pursuit of significantly improved performance. Before you begin the plan, build your training to the point where you are ...