Small balancing suggestion for the current game build: there's only single generic activity which adds the "bulking" effect (working with weights) but like half a dozen if not more instances of cardio effect (running, swimming, yoga, etc) It'd make sense for some of the latter, like yoga or swimming, to also add tiny bulking bonus, on successful exercise.
It seems also far too easy to not only maintain but completely remove "plumpness" from character, between the hunger bar requiring just two meals a day to maintain, and the cardio activities (single combo of treadmill+yoga) effectively matching or exceeding daily gains.