When the weather’s nice, I like biking. In terms of ADHD stuff, doing a thing that takes you out of your house on a loop effectively forces you to complete it. Like, if I go for a 2h ride and then decide I’m not into it half way through… I still have to keep going. But also, just being outside with varied scenery tends to make boredom much less of a problem.
When it’s hot, swimming. You can get into a really nice rhythm with it, and it’s a truly outstanding full-body workout. Also, once your endurance gets high enough, if you are doing long-distance sets, you will get fatigued, but you will also 100% be riding that endorphin high, which is kind of a fun sensation.
When it’s cold (like, New England cold, not CA cold), mostly just walks. And skiing.