For beginners, natural breathing is the main method. After entering the intentional stage, with the continuous improvement of technical level, natural breathing gradually changed into reverse abdominal breathing, and the opening and closing of the action was consciously coordinated with the throughput. If you open your mouth, you will vomit, and your lower abdomen can bulge; If you inhale together, you should swallow it, and your lower abdomen can be sunken. Every movement is opening and closing, and the abdomen is convex and concave. So after the review, you should try to make breathing and opening and closing movements cooperate organically. In this way, breathing will naturally be deep, thin, even and long. Over time, breathing and movements will be coordinated.