Generally, gyms will take photos of their members and check whether they are themselves when they enter the gym. In principle, gym membership cards can only be used by yourself, but some gyms are not strictly managed.

The membership card mentioned above refers to the membership card that can be used unlimited times in a period of time. Most gyms also have a "secondary card", which means a limited number of times to enter the gym in a limited time. This kind of secondary card is generally not limited to who can use it, and it is reduced once.