This phenomenon is not common, but you said that a completely flat mirror is actually impossible. Unless it is particularly high-end, gyms that pay special attention to customers' real sense of entity will choose a particularly flat mirror, because the perfect mirror is actually very expensive, and it is generally the kind of cheaper mirror. Those mirrors bought in the building materials market will not be peaceful.

In some gyms, in order to give fitness members a good psychological promotion, he will choose some full-length mirrors to improve the effect, that is, the kind of mirrors that make people look and feel more slender. This kind of mirror will give people a psychological hint, making them feel beautiful in the process of fitness, not only in the gym, but also in many similar consumer places, such as the yoga room or fitting room in the shopping mall.

And this will also create a psychological gap, that is, looking in the mirror at home, feeling ugly and short, looking in the mirror at the gym or in those consumer places, but feeling radiant, then they will want to exercise more on this occasion, which is a psychological suggestion.

But at present, such shops are still rare. I see more mirrors in fitting rooms and yoga rooms, which are deliberately adjusted to make people look slender. In fact, there are very few gyms. After all, the gym should not only make girls feel slim and beautiful, but also take care of boys and make them feel powerful, so there is no need for them to make the mirror uneven.