In this podcast, Thomas Domville demonstrates how to force quit an app on Apple Watch.
Reasons you might want to do this include the app becoming unresponsive, frequently crashing, or you simply having a suspicion that the app might be the cause of a more general and system-wide issue.
As Thomas demonstrates, the process is simple - 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. 2 of 3