If your Fitbit sleep score dropped this week, it doesn't mean your sleep quality suddenly deteriorated. It's just that Fitbit quietly updated its tracking technology.

I’ve tested the Whoop MG and Apple Watch Series 10 for over a month. Here’s what you need to know before buying one.

From physical fitness to stress management, lifestyle factors may help improve heart rate variability, which measures the fluctuations in time between heartbeats.

Heart Rate Variability (HRV) means the intervals between your heartbeats, and could tell you a lot about your longevity and cardiovascular fitness, according to a psychiatrist.

Cardiovascular exercise helps strengthen your heart, allowing it to pump blood more efficiently and improving blood flow to all parts of your body.

Understanding our body’s target heart rate zones and how they change as we age is crucial for getting the most out of our workouts. If your goal is to burn fat, for example, you’ll want to ...

What is a resting heart rate? Put simply, doctors define a resting heart rate as being your number of heart beats per minute while sitting still and relaxing.

Discover what your resting heart rate reveals about hidden health problems. Fast pulse signals thyroid, infection issues.

What is a normal resting heart rate? Medical professionals usually consider anything between 60 and 100 beats per minute (bpm) to be a “normal” resting heart rate.

Learn how to lower your resting heart rate naturally through sleep, movement, nutrition, and stress relief for better heart health.

Fitbit’s reworked Readiness Score assesses readiness based on HRV, sleep, and resting heart rate, providing a score from 1 to 100.