I prefer AppImages. I find system-wide installations risky in the long run, and don’t mind managing each software myself. Plus, often I have to use super old software, and when the current programs become old themselves, it’s useful, I think, that they’re as independent as they can from dependencies that may or may not be available anymore. However, still using apt download
just in case as that variant of the command also downloads dependencies.
Maybe martial arts or cross-fit? Afaik, martial arts aren’t as repetitive as usual exercises, and cross-fit is pretty mixed up.
Also, though harder given ADHD itself, as you identified problematic points of your behavior, maybe focus also on changing them?