Anything that doesn't require my entire focus on it.. sometimes it's music, some old series I'm watching for 10 years and I know all the episodes by heart, classic cartoons, a twitch streamer, my neigbor changing clothes...
It will never stop for me (health condition) and quite frankly, it helps me a lot when I go play live poker because there's a lot of distraction you can't control when you play live but you need to stay focus on your game!
-TRP-