At the very least I would assume the app would need to always be on to check whether there is a signal from the sensor.
There will then be an issue of stopping and starting the activity automatically, which I don't think will happen to be honest - otherwise you would end up with a series of stop start activities every time you stopped. You can get decent range on Bluetooth these days so auto stop and start based on nearness to the device isn't all that viable either.
Might get lucky though
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