It is true that some gyms sell cards at different prices, and cardholders enjoy different services. For example, you can't enjoy some courses, you can't use some exclusive equipment or you can't take a bath ... For consumers, when purchasing services, you should find out the charges and service contents and sign a contract, and you can complain to the management department about the obvious violation of the contract in the gym.

Personally, I think fitness will generally sweat, so bathing should be a basic supporting service and should be provided. But if it is clearly written in the contract and you didn't raise any objection when you bought it, I'm afraid it will be difficult to negotiate.