Muscle Factory Gym is listed in the official Roblox update text.
Gym Star Simulator Muscle Factory Gym Update
Use this update page to separate confirmed official additions from trainer, pet, rank, and reward details that still need current checks.
Confirmed and needs-check
What changed in Muscle Factory
Official update text is strongest for feature existence. Exact rankings and values wait for in-game or creator-owned confirmation.
New trainers and exclusive pets are confirmed, but exact names and multipliers still need checking.
New ranks, season quests, boost events, and OVERDRIVE should be reviewed before updating tier or guide claims.
Reported boost rewards such as protein bars, energy drinks, essential oils, and enchanted crystals need code-by-code verification.