>>11396165
Granted. From what I understand, a "gym bunny" is someone who goes to the gym with the primary objective to have an attractive appearance, instead of actual fitness. So that's what we will prioritize.
You will become the owner of a new gym, already filled with the necessary equipment and staff. The equipment ranges from normal gym stuff like treadmills, weights, benches and yoga balls; to stuff that looks more fit for a troll than a human being. You'll quickly discover why. The staff is pretty competent and covers all possible roles a gym could need: instructors, maintenance technicians, janitors, secretaries, accountants, and a couple doctors. All of them are, incidentally, DTF - again, I'll explain everything in a minute.
The gym itself was built over the ruins of an ancient temple (which I retroactively added to the world at the same time I created your gym). Its nameless deity is willing to provide blessings to people so that they can achieve their ideal physical form... IF they pay the price for it. Part of the price is, paraphrasing the sacred texts, "toil and sweat in service" - which basically means that people must exercise regularly. The more they exercise inside your gym, the more they'll change - and this effect can go well beyond human limits. A scrawny nerd could spend four months working out at your gym, and come out bigger than Hulk. The transformation will be based on the host's desires and will not go beyond that, so it won't be nothing that they won't like... But subconscious desires also count, and those tend to exaggerate a lot.
The transformation slowly reverses over time unless the person exercises regularly; and while this can be done anywhere, doing it inside the gym will be much more effective. So even those fully transformed will still remain your paying customers.