Fitness trackers and smart watches are widely popular wearable devices that measure several types of health metrics, including step count, calories burned, sleep quality, Vo2 max and heart rate.

Your heart rate can tell you a lot about your fitness and cardiovascular health. Your heart beats consistently, day in and day out, but you may not generally pay close attention to it. You might take ...

Resting heart rate — the number of times your heart beats per minute when you’re sitting still — is an important vital sign. Doctors measure it to check how your body is functioning, and the number ...

Calculate your target heart rate zone and work to stay in the middle of that zone while you’re doing your cardio. Here’s how you do it: According to the American Heart Association, a person’s target ...