Mankind has been using water to mark the passage of time for thousands of years. From dripping stone pots in Ancient Egypt to the more mechanically-complicated Greco-Roman Clepsydrae, the history of ...

You glance at your heart rate monitor during a tough run and an unusually high number jumps out at you. Should you be excited or concerned?

Your resting heart rate can reveal a lot about your overall health and fitness. A normal resting heart rate typically falls ...

From Apple Watches to Fitbits to treadmills, there are more ways than ever for people to keep up with their vitals. So why does so much fitness tech check your pulse? Because your resting heart rate ...