You only need your name and contact information to apply for a fitness card, and you don't need ID information.

When signing a contract, in order to clearly distinguish the subject of the contract, add the ID number, because the ID number is unique. It is also for the convenience of prosecution in case of contract disputes. Because the prosecution needs to provide the identity documents of both parties, with ID numbers. Even if there is no copy of the ID card, the lawyer can go to the public security department to check the files, and then file a case after obtaining the ID card.