Heart rate zones are a way to describe how hard you're working during a cardio workout, like running or cycling. The faster your heart beats, the harder you're working. So an easy jog might have you ...

Runners, cyclists and gym-goers with wearable fitness trackers are no doubt familiar with the five "heart rate" zones.

Add Yahoo as a preferred source to see more of our stories on Google. If you wear a Fitbit, Apple Watch or a similar wearable while working out, you already know that you have a useful tool right at ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Hear me out: it’s time to get serious about your Zone 2 cardio. ICYDK, Zone 2 cardio refers to a type of ...

Few would disagree that cardio, also called aerobic exercise, is good for your health. Of the 10 most common chronic diseases, seven are "favorably influenced by regular physical activity," according ...