my iwatch is not measuring my heart rate
How do I get my iWatch to measure heart rate. Something has changed in the past two days and this feature no longer works
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If this is happening during a workout then you most likely have "workout power saving mode" enabled,this turns off the heart monitor during workouts.
On your iPhone, go to Settings/Privacy/Motion & Fitness and check that both Fitness Tracking and Health are On.
Open your iPhone’s Watch app and go to Workout and make sure that Workout Power Saving Mode is Off.
Next, go to Privacy and check that both Heart Rate and Fitness Tracking are both On.
Finally, go to Passcode and check that Wrist Detection is On.
If any of these settings are incorrect, they will prevent your watch from reading your heart rate during a workout. Set them correctly, and test your watch again.