I used to lift heavily in high school to help in sports, I’m on the shorter side but I still to this day fill out the sleeves of a typical polo. I haven’t been inside a gym or worked out other than my mostly daily walks in over twenty years and still have relatively defined muscles. I’ve never used anything other than protein powder when I was in high school although I did hit the gym three times a day five days a week back then (my teachers let me skip class to go workout). Nobody is going to mistake me for being cut but I’m also nearing fifty and still have large muscles compared to a lot of people I run into. At this point I have to assume it was from rigorous lifting while in my youth and retaining a portion of that or genetics which I’m less inclined to believe but only emotionally because I strongly dislike my bigoted family.