1. First, let's get the gist. Let's practice the outward flexibility of ankles and toes. Practice back and forth like this. Then let's practice crossing our feet.

2. Then we practice three running links with our left foot, and then a front butterfly stroke, moving forward through the teaching. When lifting, the left foot presses the right foot, and then when falling, the hind foot is lifted, lowered to the front, and then lowered to the front. This is called the front butterfly, and the front foot is raised and falls behind, which is the back butterfly.

3. The continuous action is similar. Continue to retract the outstretched leg, and then cross your feet and separate. Note that this foot is the opposite of the last one.

4. Finally, you just need to practice more, practice again and again, pay attention to the front and back of your steps, and exchange them repeatedly.