First, as we all know, it is easy to sweat during fitness, and once the sweat runs down your face, it is a very uncomfortable thing. Not to mention wiping sweat while exercising, which greatly affects the efficiency and mood of exercise. The professional hat contains a special sweat-conducting design, and there is a layer of cotton fluff belt at the contact with the forehead skin, which can be used to absorb sweat produced during exercise.
The second is to keep the human head warm. When exercising in the gym, because the human body sweats more, sweat will take away part of the body's heat. The forehead perspires constantly and dissipates heat quickly, and there is no insulation layer similar to other parts of the body, such as fat layer. This may cause dizziness and other physical discomfort symptoms, so the hat also plays a role in keeping the head warm. Fitness is to get a stronger body, so it is very necessary to take protective measures during fitness.
Third, there are various personal reasons. Perhaps in order to keep a good figure, wearing a hat can better fix the hairstyle, especially for girls. Even girls who love fitness very much probably don't want to see their faces greasy, so wearing a hat is a very good choice. It may also be that you simply don't want others to bother you or notice you. Wearing a hat is equivalent to drawing a clear line with the outside world psychologically, weakening the interference from the outside world, thus achieving the purpose of exercising with peace of mind.
Whatever the reason, people always have their own choices. We exercise ourselves and don't need to pay too much attention to other people's clothes, words and deeds. Focus on what you are doing now.