A few of the most important insights are heart rate variability (HRV), which describes the difference in time between the beats of your heart, and resting heart rate (RHR), which is the number of ...

The best heart rate monitors will track your heart rate comfortably, consistently and accurately ...

Tracking your heart rate with a heart rate monitor (HRM) during your runs is one of the most powerful ways to optimize your training, whether you're a dedicated marathoner, power triathlete, or just ...

You might love the motivating tempo for workouts or the cadent call for calm that a smartwatch heart rate monitor provides. But when it’s time for an upgrade, what ...

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. July 9, 2025 Add as a ...