You're spot on, got the spandex, found the online community, but I feel that sense of wanting more, here's 2 fantasies.
A world where full revealing spandex is acceptable in the gym again, in other word go back to the 90's. With one slight twist, while the men would wear spandex shorts, tights and unitards, they would also wear the female orientated gym wear. So leotards, lycra shorts and crop tops, occasionally with the thong on top, and also putting a thong on top of a unitard. There are rules, being no leaving until visibly drenched in sweat and only arriving at the gym in spandex only, no loose clothing or gym bags. They'll even be awards for the sexiest outfit ensemble and most amount of effort put into the gym.
Or a spandex only boot camp for horny, spandex loving but overweight guys, like me. An extremely tough boot camp regime, no stopping during exercise. The outfits are full bottom leotards with leggings in which the would stay in until each member reaches a goal weight, the outfits get more revealing and the boot camp turns into a competition to find the fittest where the workouts get harder. The winner get to join the boot camp as an instructor, the loser, has to get into bed with the winner and being dominated, and to stop they have to use a safe word. If rules are broken, the members face an ultimate humiliation. pink spandex and sniffing other spandex cladded members.