First of all, we must make sure the authenticity of this card, that is to say, we must make sure that this card is sold by a gym or fitness club, not an imitation card.

Second, there are many ways to buy cards, including face-to-face transactions and online transactions. Before deciding to buy a second-hand card, it is best to go to the gym with the seller to check and determine the balance in the card. If it is an online transaction, you should also contact the seller to check in the physical store.

The third is to determine whether the cardholder entrusts the transaction himself or others. In either case, you should go to the gym or fitness club to confirm, modify the information in person, and then make a transaction.