The MZ-3 Heart Rate Monitor is the best live calorie-burning tracker I've used over the years ... The sensor is just five ...

Smartwatches like the Apple Watch Series 8, for example, can act as a handy extension to your phone, while small and discreet smart rings (think Oura rings or the Ultrahuman Ring AIR,) are best ...

While you can track your heart rate with the best smartwatches ... Connecting your Google Pixel Watch 3 to compatible fitness equipment or apps can help you monitor your heart rate during workouts ...