Same, I had lots and lots of outdoor activities (unstructured) mostly revolving around riding my bicycle. I'm sure I got lots of energy out that way. I rode to and from elementary school, and would ride after school, then also was an active swimmer. Not sure some of those are everyday options for young people (generally speaking in urban/sprawl suburban/helicopter parenting places). Mostly I think my home discipline helped me 'focus' on doing school and those things, to allow things to get channeled...like picking up guitar seriously at 14.
Not going to get good at guitar without focusing and practicing, if I'm honest. So, in a time when I would've been out riding my bike, I was concentrating on the instrument and tiring out my brain daily I think. Well, and the whole "don't do well in school don't get to play guitar" thing hanging over my head (for the best).
I kind of think I'd be, well, maybe a less creative person today because I like to let my mind wander. A person recently asked "How do you remember so much erratic & tangential information so fast?" and my only reply was thinking my brain is like a giant orb-spider-web-thingy that can fire stuff all around really fast and bring it back. I like to think my wandering mind made the most of spending time in the local library as a kid too - pick up book, read for a while, get another one, etc.