heart rates

Devices to check your heart rate during your workout, rollercoaster ride, presentation, or everyday life.

The smartwatch's new ECG function brings fitness trackers into real medical care.

How they work and what healthy data looks like

It's based on the suffering of 4,637 Norwegian men and women aged 20 to 90.

It works with pretty much any cheap pair of earbuds.

Vertigo-inducing peaks and valley during the "red wedding" scene? Yep. Looks about right.

Personal fitness monitors designed to encourage healthy habits typically involve uncomfortable gear, such as chest straps and armbands, that can … Continued

Don't even think about coming up for air

Brett Zarda reports on an intriguing patent application