If you decide to give your watch to a family member, or if you just want a fresh start, you should reset the watch. All of your personal data will be removed and the watch will restore back to its default settings, so you won't have to worry about personal info still being on it. You can reset your watch using the Settings or Reboot mode on the watch.
Before resetting your watch
Whether you plan to keep your watch or give it to a friend, you should back up your data before you perform a reset or recovery. This ensures your data can be restored after it's reset.
In the event you do give the watch away after the reset, be sure to unpair the Bluetooth connection between the watch and your phone. Just navigate to and open the phone's Settings, and then tap Connections. Tap Bluetooth > tap the Settings icon next to the watch > and then tap Unpair.
Perform a reset from the watch's settings
On the Watch Menu:
Navigate to Settings
Click on Resume
Perform a reset with a Force restart
Press and hold the Power key on the watch for more than 10 seconds to restart it.