Can I use my iPhone's Action Button to control trip recording?

On iPhone 15 Pro and later, the Action Button can run any Shortcut. Open Settings → Action Button → swipe to Shortcut → choose a Speedometer action like "Start or Resume". Now a single press of the Action Button starts or resumes a trip without unlocking your phone or opening the app — ideal for cyclists, runners, and motorcyclists who can't reach the screen mid-ride.