July 14--A device a fraction of an inch long is providing George Saenz with a peace of mind he has never had before. Three weeks ago, the 67-year-old independent insurance agent had the Medtronic ...

Polar Launches Whoop-Like Screenless Fitness Tracker, No Subscription Needed The Polar Loop monitors activity, sleep, and heart rate in a design familiarized by Whoop. The key difference is a one-time ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." If you are an athlete in training or simply keeping tabs on your vitals, measuring your heart rate is a ...

Heart rate is one of the most valuable physiological metrics for runners because it provides objective real-time insight into how hard your body is working. Unlike pace or distance, which are external ...