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How to measure your heart rate

In the case of Apple Watch

When you start in the Zones app on Apple Watch, it will automatically measure the heart rate.
The measured heart rate , are also registered in Health App of the iPhone.

Your workouts that were registered in the other app, it will be displayed if there are your heart rate in Health.

If your Apple Watch doesn’t stay in place, or the sensors aren’t reading your heart rate, tighten the band a bit.
For more information in here.

Others

Please put your heart rate to the Health App.
There is a heart rate monitor that measured the heart rate can be shared in the health.
Please check your heart rate monitor.

Reference