M odern smart watches can measure an array of health indicators. Step counts and heart rates sit at the simpler end, while ...

If you wear a fitness tracker, you've likely seen a stat labeled "HRV" pop up on your screen. But what does it mean, and does it matter? Short for heart rate variability, HRV has become a popular ...

Thanks to wearable devices, you can use all sorts of metrics to keep track of your health. You can check your weight, blood pressure, the number of steps you take, heart rate and more as you go about ...

You probably check your step count religiously, maybe glance at your heart rate during workouts, and might even pay attention to how many calories your fitness tracker claims you’ve burned. But ...