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Syncing Garmin Data With Weight Watchers on an iPhone
Weight Watchers will only allow you to sync one device or app at a time. If you are using an iPhone you will need to turn off Apple Health in order to sync a Garmin device with Weight Watchers.
Apple Health can be disabled by following these steps:
Open your iPhone Settings app.
Select Privacy & Security.
Select Motion & Fitness.
Disable Fitness Tracking and Health.
For more information, see Tips for Syncing Your Fitness Device.