Once you permanently disable Heart Rate on your Apple Watch, it turns off the green light from shining again. It also means your Apple Watch will no longer measure your heart rate when you’re wearing it.
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From now, during workouts, Breathe & Reflect sessions, your Apple Watch will not measure and show your heart rate.
And if you open the Heart app to take a reading of your heart rate manually, it will ask you to enable it first from the privacy section of the Settings app. If you decide to re-enable it, follow the same steps as above and turn on the Heart Rate toggle.