I have long suspected that I train at higher heart rates than I should. When I go out for a run I generally start out with a short walk, then a jog and by the time I am at a half mile I am running at a fair clip. I have learned how to listen to my body and know when I am running too fast to sustain my distance goals for the day. When I reach that point I pull back and run just below that line, which nowadays is about a 9:30 pace. I usually end my run with the last half mile at my 5K pace (around 8:00 pace or so). I stop at my driveway completely spent and hope that I am recovered enough to do it all again tomorrow. Little did I know that all that running wasn’t doing my fitness as much good as I thought.