This article explains how to close a running app on your Apple Watch Series 3 or later. It also includes information on how to force close apps and how to restart your Apple Watch.

If your Apple Watch is running slow, losing battery quickly, or getting stuck in a program, it might be time to close some apps. Closing apps that you’re not using can give your Apple Watch a fresh start, restore its usability, and get you back to work.

To clean up the running apps on your Apple Watch by closing the apps you're not using, follow these steps:

On your Apple Watch, press the side button (not the digital crown) once.