4 new gadgets that track heart rate

Two fingers pressed against your neck or wrist. That’s how most of us checked our heart rate in simpler, analog times.Now, you can track your heart rate by wearing a chest strap or wristband—or a headband, earbuds, or smart clothes like shirts, blouses, and bras. Here are four new or recent activity trackers that offer heart rate tracking, with varying degrees of accuracy. Moov HR Sweat
The $100 headband features a pocket, into which you slip a sensor that reads your heart