How can I use Google Fit to track my workouts on my smartwatch?

To track your workout on your Android watch, download the Google Fit app on your watch.

You can usually find Google Fit on your Wear OS watch already. If it is not there, you can download it from the Play Store on your watch.

To set up Google Fit on your Wear OS watch & phone (article from Google)

If you have a Samsung Galaxy Watch4 Series, you can use Google Fit to track your workouts by following these steps:

Download the Google Fit app from the Play store.
From the Home screen on your watch, swipe up to access the Apps screen, and then navigate to and tap the Workout tracker (it looks like a man running).
From here, you can select your desired workout. Swipe up or down to view the suggested workouts, or tap + Other workouts to add a new one. All workouts will be listed in alphabetical order, so you can easily swipe through the options to find the one you are looking for.
Tap your desired workout, and then tap Start in the center (it looks like a play button). Note: Some workouts will require GPS to be turned on.
A countdown will begin. Different types of movements and data will be tracked depending on the workout. Tap the Center of the screen to toggle the Calories, Clock, steps, and Heart Points.
When you are finished, the watch will stop tracking. Or, you can swipe right and tap Pause or Stop. If you paused the workout, you can resume by tapping Start again.
The watch will give you a summary of your workout, which includes the duration, Heart Points, Active time, and calories burned.
Tap the check mark to save the data, or tap the Delete icon to remove the data.

For more details on tracking with Google Fit on your Samsung Watch4, you can refer to this article

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