Optimize your running training by properly applying the hard easy principle.  You must keep your easy runs easy and your hard runs hard to get the desired training effect. Most runners are driven to check their watch, worried about their pace being too slow, even when it's an 'easy' run day, and this prevents much-needed, injury-preventing recovery.  In this episode, I explain the appropriate time differential between hard and easy runs and provide suggestions for how to avoid running too fast at the wrong time. Don't forget to subscribe.