Return the fitness card, but determine the penalty according to whether there is a breach clause in the contract signed by both parties. It is unreasonable to return the card if it is not stipulated in the contract; It is reasonable to stipulate that it is necessary to pay liquidated damages for card withdrawal.

According to Article 107 of the Contract Law of People's Republic of China (PRC), if a party fails to perform its contractual obligations or fails to meet the contract, it shall bear the liabilities for breach of contract such as continuing to perform, taking remedial measures or compensating for losses.

Article 108 If one party expressly expresses or shows by his own behavior that he will not perform his contractual obligations, the other party may require him to bear the liability for breach of contract before the expiration of the performance period.

Extended data:

Law of People's Republic of China (PRC) on the Protection of Consumer Rights and Interests Article 53 Where an operator provides goods or services in advance, it shall provide them in accordance with the agreement. If it is not provided in accordance with the agreement, it shall fulfill the agreement or return the advance payment according to the requirements of consumers; And shall bear the interest of the advance payment and the reasonable expenses that the consumer must pay.

Article 54 Where a consumer requests a return of a commodity that has been identified as unqualified by the relevant administrative department according to law, the business operator shall be responsible for the return.

Quzhou Municipal Government-People's Republic of China (PRC) Contract Law