Ready to take your training to the next level? Here are the best heart rate monitors to track your fitness and health goals ...

What is heart rate variability (HRV)? As popular as the metaphor may be, a healthy heart doesn’t beat as regularly as a metronome. In fact, it changes its rhythm with each beat. Heart rate variability ...

For HRV, you'll need a smartphone app or wearable device that can detect the subtle variations between heartbeats. Take ...

Heart rate variability typically decreases during stressful situations, although the heart rate increases. Managing stress levels can mean a more variable heart rate. Exercise and relaxation ...

We've tested and reviewed products since 1936. Read CR's review of the Garmin Forerunner 945 Music smartwatches & fitness ...

Apple, Garmin, Samsung, Google or Amazfit? I put these watches through the paces to see where they land on step, distance and ...