Earlier quoted context omitted.
That’s weird, I have perfect running detection on an old(er) (Apple) watch. Detection does start late (but is retroactive, so it’s not an issue).
And that's by design, because it waits for a larger window of data to gain confidence. Notice how you ~never get false positives on it starting an exercise session. I see comments like GP's often enough that I think Apple just does a bad job explaining how/why it works.
Oh, I absolutely do.