1. Swing leg movement: hold the shallow pool and breathe with your mouth, lower your head and swing your legs. The thigh drives the calf, the knee can't bend, the feet are slightly straight, and you can swing up and down on the water alternately until the practice is finished.

2. Swing your legs when walking: inhale in the shallow pool, move your center of gravity forward, swing your legs forward with your hands, and slowly move forward until you can swing 5 meters.

3. Swing legs and hand strokes: when walking, hand strokes are added on the basis of swinging legs, arms are bent on the water, elbow joints are raised, and palms are inserted outward and forward; Draw your chest underwater and then come back.

4, freestyle ventilation: when the hand is inserted forward, the head spits out 80% of the air through the nose and mouth underwater and swings the leg once. When the right hand draws the water vortex backwards, the water surface turns 90 degrees to inhale through the mouth and swing the legs once.