This revolutionary training method has been embraced by elite runners-with extraordinary results-and now you can do it, too. Respected running and fitness expert Matt Fitzgerald explains how the 80/20 running program-in which you do 80 percent of runs at a lower intensity and just 20 percent at a higher intensity-is the best change runners of all abilities can make to improve their performance. With a thorough examination of the science and research behind this training method, 80/20 Running is a hands-on guide for runners of all levels with training programs for 5K, 10K, half-marathon, and marathon distances. In 80/20 Running, you'll discover how to transform your workouts to avoid burnout. - Runs will become more pleasant and less draining - You'll carry less fatigue from one run to the next - Your performance will improve in the few high-intensity runs - Your fitness levels will reach new heights.