Yep, just zone out. Try to cultivate some equivalent of highway hypnosis. Or just actually go walking out in the real world instead of using a treadmill. It's

Yep, just zone out. Try to cultivate some equivalent of highway hypnosis. Or just actually go walking out in the real world instead of using a treadmill. It's way more interesting. Bonus points if there's some offroad / bushwalk type stuff in there, it's great for all your control muscles.