When I walk behind a wheel hoe or run Barty (the walk-behind tractor) around the farm to prepare ground or cultivate, I find that my mind is able to multi-task fairly well. Obviously, I have to pay consistent attention to what I am doing so I don't destroy plants I want to keep with the wheel hoe and the stakes are higher with the walk-behind tractor. With Barty I can both destroy plants AND potentially do a bit of harm to myself or whatever else gets in the way.