With the Loop, Polar is clearly coming for Whoop. Like its inspiration, the Polar Loop is a screenless fitness tracker that measures your activity, heart rate, and sleep with a design that combines a ...

I’m PCMag’s senior writer covering smart home and wearable devices. I’ve been reporting on tech professionally for nearly a decade and have been obsessing about it for much longer than that. Prior to ...

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 ...