I want to disagree with how you got to this conclusion, but in the end anecdotally this is 100% me. I’m a runner with ADHD and if I don’t run for a couple days I go crazy. Exercise in generally has made me feel infinitely better as an adult.

But I don’t think effects of ADHD should be limited to “acting out”. And there wasn’t the same abundance of cheap stimulation 30 years ago for me.