While heart rate zones might sound a little confusing ... (HRR): MHR - RHR = HRR Apply the Karvonen formula: (HRR x % ...

Here's how Zone 2 cardio works and whether there are any real benefits of getting ... in the zone ... with this fitness trend ...

To get the most out of a cardio workout, you need to get your heart rate into your target heart rate zone. However you keep your heart rate elevated—by running, doing intervals on an elliptical ...

You need an accurate max heart rate to set your zones properly (more on that below), and an age-based formula is not guaranteed to be correct. You have more important things to do than stick to zones!

An easy way to find out is by knowing your target ... to track your heart rate, or you may have a digital fitness tracker that does it for you. So get moving and get in your zone.