If your goal is to develop the endurance component of your running fitness quickly and safely, this is your training plan. This 11-week Level 1 80/20 Build Endurance Run Plan will boost your stamina and range without overtaxing you or neglecting other fitness components. Featuring the proven 80/20 intensity balance described in Matt Fitzgerald's bestselling book 80/20 Running. TARGET ATHLETE This level is intended for runners with some experience who are ready to benefit from running more ...