That heart-pumping, give-it-your-all feeling is one of the reasons many of us run in the first place. And a ramped-up heart rate during any type of exercise is not only normal, it's necessary. But ...

Running too fast is a beginner mistake, but that doesn’t mean your runs always have to be turtle-slow. If you’re a beginner runner, you’ve probably heard the advice that you’re running too fast and ...