When developing an app, it is sometimes useful to force-quit an application without having to re-start the entire device.
On my iPhone, I can force-quit the active app by double-clicking the home button and swiping the app to the top.
For the actual Apple Watch (not the simulators), force-quitting an app is particularly useful since there are sometimes connection problems between Xcode and the watch app. Also, sometimes I would like to force-quit my Apple Watch app when it is not connected to Xcode.
So, how can I force-quit / terminate the active app on the Apple Watch without restarting the entire device?