You can restore all of the watch settings back to the factory default values.
Hold the touchscreen to view the menu.
Select
> > Reset.
Select an option:
To reset all of the watch settings to the factory default values and save all user-entered information and activity history, select
Reset Default Settings.
To reset all of the watch settings to the factory default values and delete all user-entered information and activity history, select
Delete Data and Reset Settings.
> 
> Reset.