How to fix apps not working or freezing on Apple Watch

Apple Watch with black and white app bubble on a yellow background with sad face showing apps not working

Here are possible solutions to fix issues when trying to open an app on your Apple Watch, and it freezes on the loading screen, doesn't open, stays stuck, or crashes. After implementing some of these potential fixes, apps on your Apple Watch should work fine. Please note that these fixes work for all watch models running any version of watchOS, including watchOS 8.