Possible to detect change in Watch activity?

I'm creating an app where a user will be swimming using the HKWorkoutSession where the activity type is declared at init. However, what if the user leaves the water and starts running. Is there a way to detect this transition?

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You cannot detect water on the watch. A swimming stroke involves the motion of the palm downwards. That motion is a constant rotation of the watch along the Y (I think it's Y) axis. This is true for crawl, back, butterfly and ****** strokes (but not kickboard).The same is not true of running. Detecting that motion is a reasonable surrogate for 'the person is swimming'.

It looks like Apple Watch detects your activity type,

while starting an elliptical activity it will ask you whatever you started elliptical?