It depends, of course. But on what exactly? Running coach Matt Fitzgerald explains a simple process of finding your ideal heart rate.

Exercising at your max heart rate might leave you drenched in sweat, but that doesn’t mean it’s something you should do regularly. In fact, spending too much time in the high zone could cause symptoms ...

A few of the most important insights are heart rate variability (HRV), which describes the difference in time between the beats of your heart, and resting heart rate (RHR), which is the number of ...