In this special three-segment episode, Heather explores the idea of following your heart -- literally -- when running. She talks first with Michigan Runner Girl Lisa Payne Kirker, a New Era, Mich. runner, blogger and mother of two, who decided to try heart rate training this summer. She shares her motivation for giving this method a try, the races she planned to train for using her heart rate monitor, and what it feels like to sometimes be running a 16-minute mile (she's typically a 9:30-10:30 min/mile runner) as part of this new-to-her training. In the second segment, Coach Lisa Taylor joins Heather in studio to demystify heart rate training -- what does it mean exactly, why runners are considering it, and the potential benefits of following this kind of training plan. Finally, in segment three, Heather circles back to Lisa Kirker -- several weeks after their initial conversation -- to hear how her running has changed and her training evolved as a result of monitoring her heart rate while exercising.