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This could be part of the step counter algorithm. There is already detection for walking, and I've experimented with distinguishing between walking and running. There could be an event for "start running" for a widget to hook into. That said, do you use that feature on your other watches? When I was gathering a list of features from friends with sports watches, this was one people said they didn't use because they prefer to start the activity manually.
That makes sense especially if someone codes something like "automatic activity recognition" where the run app and recorder would be triggered by specific motion recognition (Is this related to Machine Learning or TensorFlow ? You guys may know)
I'll test it more later.