Garmin Connect syncs natively with Apple Health.
Setup Garmin Connect on your iOS mobile device (guide)
Link Garmin Connect to Apple Health
Open up the Apple Health app and navigate to Settings
Select Garmin Connect
Follow the on-screen instructions
Note: The Apple Health app allows you to choose which data to sync. Choose Turn On All
Link Apple Health to the FitBark app (guide)
Garmin Connect does not sync natively with Google Fit. However, there are several third party apps that can help you sync your data from Garmin Connect to Google Fit. Please bear in mind that we are not affiliated and don't specifically endorse any of these apps.
Here are the steps to follow:
Setup Garmin Connect on your Android mobile device (guide)
Link Garmin Connect to a supported app such as:
Health Sync (paid)
Health Connect (free beta)
Link Google Fit to the FitBark app (guide)