Legal analysis: Whether it is legal for the gym not to stop the card depends on the agreement signed when handling the card. According to the contract, it is illegal for the gym to refuse to stop the card if the customer is allowed to stop it. However, if the contract does not stipulate that the customer can stop the card, then the gym also has the right to refuse to stop the card. So whether it is legal or not depends on the contract signed by both parties at that time. According to Chinese laws, a legally binding contract is only binding on the actions of the parties.

Legal basis: Article 119 of the Civil Code of People's Republic of China (PRC), a legally established contract is legally binding on the parties.