Dear Doctors: I'm a 55- year-old man, and I have been active all my life. I know target heart rates are based on age and was surprised that my heart rate while running is often between 150 and 195.

Most runners can benefit from monitoring heart rate in different ways during half marathon training. For example, you can use heart rate to set training zones, which will help you dial into the right ...

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 ...

Sitting quietly at your desk, watching TV, or lying in bed at night, your heart should be taking it easy – beating steadily and calmly at somewhere between 60 and 80 beats per minute for most healthy ...

I tested them against the Apple Watch and the Polar chest strap to find out whether you can trust them for your workouts.

Training for a race doesn’t just mean plotting your weekly miles and heading out the door. You also have to figure out exactly how to approach each run, so you can maximize the benefits. With a mix of ...

In this era of fitness trackers, we have easy access to our heart rate at any given moment. Every so often, a number catches ...

If your Fitbit Charge 6 is giving you heart rate readings that are clearly wrong — showing 85 BPM during a HIIT workout when you’re gasping for air, spiking to 200 BPM while you’re sitting on the ...