That depends on the contract with the gym, which is generally refundable. It is best to consult and coordinate with the local consumer association to see if there is a overlord clause according to the contract. The gym will find various reasons not to return or to return less. If you return your card every time, you will return more. If it is a monthly card, the Consumers Association will return it. When returning, it can be calculated according to the number of times (days).