handwashing
Washing your hands is a crucial way to remove germs and prevent infections from spreading, and it's never been more important in the face of the COVID-19 pandemic. Experts say that you should wash your hands for at least 20 seconds, especially if you’ve been in a public place or have come into contact with surfaces that could transfer germs.
To help you with this goal, watchOS 7 unveiled a handwashing tool that detects when your hands are under running water and gives you a 20-second countdown from start to finish. Enable the handwashing reminder directly on your watch by going to Settings > Handwashing, then turn on the switch for Handwashing Timer.
You can also enable location-based reminders, so if you arrive home and have yet to wash your hands, your watch will make sure you don't forget. The next time you start to wash your hands, the timer should kick off and reward you with a chime and a “Nice one” if you make it to 20 seconds.