The method of using Google Fitness for domestic watches is to open Google Fitness in the watch, log in with Google account, and you can start using it. To turn on Google Fitness, you need to install Google Fitness interface on your watch to use it. If there is an interface on the watch, you can use Google Fitness to measure, track and store personal fitness information on mobile devices and smart watches. Set goals according to personal fitness needs and automatically measure your own goal progress.