Do you know the best exercise for your brain? Actual exercise. Running increases neurogenesis[1] more than anything else. [1]: https://www.nytimes.com/2017/10/04/well/move/for-your-brains...
Amusingly, I would not be surprised to find some people need both. In particular, exercise is boring. Very very boring. Anything that can help with concentration during boring tasks is useful. Obviously, that is my experience. Ymmv
Now I run outside for sometimes five times as long as I was running back then, without podcasts or TV shows, and I never get bored. I do run slower, though. Try going slower next time! And going outside in a straight line or long loop. I get very bored/frustrated if I have to do laps to make my distance. Of course YMMV too.