What do you mean by open class in gymnasium?

It means an "open lecture" aimed at popularizing scientific fitness knowledge and concepts, which has attracted many fitness enthusiasts to sign up. Fitness is a kind of exercise, such as all kinds of unarmed aerobics, rhythmic gymnastics, rhythmic gymnastics, and all kinds of self-resistance movements. Gymnastics and yoga can enhance strength and flexibility, increase endurance, and improve the ability to coordinate and control all parts of the body, thus making the body strong.