Dr. Stephen Seiler is a well known Exercise Physiologist. He has studied the training habits of many world class endurance athletes and discovered the 80/20 Rule that also applies to endurance training. Meaning, working out 80% of the time at low intensity and 20% at high intensity. This polarized approach is now widely accepted by coaches and athletes around the world. We talk about exercise physiology and training adaptations. Video version of this interview: https://youtu.be/dxODgYXOO7w