Swim workout on watch won’t end

Hello jeanene115,

Welcome to Apple Support Communities!

We understand that the Swim workout on your Apple Watch won't end. We're happy to help!

"Apple Watch: With the app open, press and hold the side button to show the power options. Then press and hold the Digital Crown to quit the app."

For more information about apps not responding see this article:

If an app unexpectedly quits, stops responding, or won’t open

Let us know if you have any questions.

Thank you for using Apple Support Communities.

Take care!