Building a real-life version of the Star Trek tricorder has been the goal of engineers and hackers alike since the first time Dr McCoy complained about being asked to work outside of his job ...

When it comes to exercising, your heart rate is the gold-standard metric to uncover how hard you're pushing. It tells you whether you're working aerobically or anaerobically, how your body is reacting ...

Everyday Health independently vets all recommended products. If you purchase a featured product, we may be compensated. Learn why you can trust us. ON THIS PAGE Whether you're trying to lose weight, ...