If a treadmill is boring, isn’t doing enough on the treadmill itself to me, like going a bit more intense, getting out of breath, changing the incline and so on. I couldn’t be focused playing a game and run, its one or the other, I’d only do 90 minutes intense and game later anyway. I’d only use a bit of music for that 90 minutes or something else stops the run. If treating running as a game, then some video game music could very sell be part of the entertainment.