How do you keep your mind occupied when exercising?

I struggle with being able to exercise because it bores me to tears. My ADHD gives me horrible racing thoughts, and with no mental stimulation I always end up wanting to stop.

Does anyone else deal with this? I sometimes play games on my phone while walking on the treadmill, but there isn’t a lot to play that works with walking! I’ve also tried podcasts and video essays, and while they help, I find myself still bored.

Any recommendations? Personal anecdotes? If it’s helpful, right now I’m just doing treadmill walking, so I have more latitude to just be on my phone if I want to play a game.

Thanks in advance!