Heart Rate Tracking

If you've ever wondered why your heart rate is high, even on easy runs, here's why you may be feeling a rapid beat—and when to worry about it.

Your body is a powerful machine, and at the center of it all lies a strong, pounding engine.

An easy, common-sense approach to finding your max heart rate without a laboratory stress test.

Smartphones and watches now make tracking and managing stress easier than ever.

One company found that runners and astronauts can benefit from the same technology.