Under normal circumstances, it is not allowed. After all, in this era, with the increase of floating population, ID card inspection is quite strict, including Internet cafes. Mothers must find their own family to accompany them for their own safety. It may be possible for some gyms that are not strictly managed. Secondly, when they go to the gym, they usually apply for membership cards and discount cards. It is always impossible to take someone else's ID card every time.