"TRAIN EASIER TO RUN FASTER 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...