Many fitness trackers and smartwatches claim to be able to monitor your heart rate. They operate by shining a light into your wrist, which is then reflected by blood vessels passing through your veins. When your heart pumps, the blood moves through your veins at a quicker rate, causing less light to be reflected back. The tracker then calculates your heart rate using an algorithm.
Essential reading: Best heart rate chest straps
The current trend may be to move heart-rate monitoring to the wrist but accuracy at this new location is still questionable. Particularly for high intensity workouts. If you are very serious about heart rate training, one of the options below is the way to go.
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