Then install Health Sync on your phone.
Open the application, then press "OK" to get started.
The next screen explains that you can choose which direction you want to synchronize the data. press "OK" to continue.
Select 'Samsung Health' as the primary sync source.
Then tap 'Google Fit' as the sync destination, then tap 'OK'.
On the 'Preparation Actions' screen, tap 'Google Fit Login Test'.
This opens the Google login screen. Select the account you use with Google Fit.
Then tap to grant 'Activity Information License' and grant Health Sync access to your activity.
Click 'Allow' in the pop-up window.
Now, you need to change some settings in Google Fit, and it will not affect fitness synchronization. Click 'Check activity tracking in Google Fit'.
A message appears instructing you to turn off Tracking your activity in Google Fit. Click 'OK' to open the Google Fit app.
The Google Fit app will launch. Click 'Profile' at the bottom of the toolbar.
Click the gear icon on the top right to open 'Settings'.
Scroll down and make sure 'Track your activity' is off. This will ensure that Google Fit does not affect Samsung Health app tracking.
Release the Google Fit app and reopen the Health Sync app. Click 'OK' in the 'Initialization Completed' pop-up window.
Now, all we have to do is select the fitness data you want to sync between the services. Some of them will require additional rights.
Finally, you can go to 'Settings' to adjust the sync frequency and / or optimize the battery. To do this, simply tap the icon with the three dots at the top right.
Then click "Settings".
That's it! You may receive periodic notifications about sync status issues, but the app itself will explain how to resolve them.