Yes If you specialize in swimming and enroll in swimming classes, you must have a coach, don't worry. Gym swimming pools are generally equipped with coaches, especially to teach some primary school students to swim, but there is a charge. Of course, there are also some enthusiastic people who like to tell you how to swim, help you correct your swimming movements for free and become amateur coaches. Of course, the coaches in the swimming pool are more formal. They teach swimming and work as lifeguards.