APPLE INSIDER
Just swapping to another band may be enough to make a future Apple Watch reconfigure settings, start workouts, and track your strap usage.
Just changing the strap could make an Apple Watch switch to a different face or reconfigure settingsRight from the start, the bands or straps for Apple Watch have contained a feature that is typical of Apple. The way that they attach and detach so firmly yet so easily is an example of how the company finds that one thing nobody else has thought of, yet everyone else now knows is right.
Source: APPLE INSIDER