I think there are many repetitive actions that could qualify. Things that you do over and over, and have repeated so often that they no longer require concentrated focus of the mind, so the brain goes on autopilot, so to speak. As an electrician, there were many such tasks, such as attaching rectangular fluorescent light fixtures to a ceiling grid with screws at each corner. On large jobs, I would spend many hours and days on end doing this, and my mind would wander all over the place. Sometimes I would enter into prayer, like the Jesus Prayer, but most often I would daydream elaborate fantasies where I was doing anything but attaching light fixtures to a ceiling with screws.