If there is no foundation, the first is to ensure safety, and the second is to choose a good coach. There are swimming classes in Yantai Swimming Training Center of Southwest River, Swimming Pool of Hangyuan, Juxing Swimming Pool of Oriental Paris Community and Ginza Swimming Pool of World Trade Center. Personally, I recommend Zhao Jia, a coach from Aviation Academy, a provincial swimming champion, the sixth national triathlon coach and a national certified coach, but there are many students, so it is necessary to arrange the time after registration.