OK, I see there is some difference of opinion on the rules, and I do agree 100% that a business owner should have the right to set a dress code or rule on smoking or not, shirt or not, etc.... But my point still stands, that if you call your business by a name that indicates a place to go work out, and if most people want to wear muscle shirts when they work out, and that's the case at least in all the gyms I've been in, they should be allowed. If they look ridiculous in a muscle shirt because they're skinny, obese, way steroid-bulked out, or whatever, THEY're the ones who look goofy, and I don't care if some other bro looks goofy. I look goofy anyway, with any clothes.... There should be a rule that the muscle shirt (and all other gym clothing) needs to be clean and not walk in with it stinky, because otherwise it's offensive to others working out, and that's rude & disrespectful. If you want to set a dress code requiring sleeved shirts, and to rule out any sounds such as grunting or banging plates, etc., and you are selling bagels and pizza, it should be called "Planet Social Club" in stead of "Planet Fitness". Of course I don't want to see pit hair while I'm eating in an expensive restaurant, so obviously that's where you have a regular shirts-only rule. Just to clarify, I think most dress codes are BS, except for in church, school, and courtrooms. As long as you smell good, and appear clean, it shouldn't matter what style of clothes you have on, to play golf, eat in a restaurant, or sit in a theater. But again I do respect the rights of all business owners, and therefore I won't break the rules or argue them. I will simply not go in businesses where I don't agree with the rules.
Charles