Second, you must reach out to the end after entering the water to ensure that your body's center of gravity is in the right position. The new bird paddled with the front cross.
Third, usually the head is buried in the water (looking straight at the bottom of the pool), and only when the water is pushed to the waist, the side head takes a bite with its mouth. If you look up, on the one hand, it will affect the center of gravity, on the other hand, it will increase the positive resistance. Finally, when you bite your shoulder, you will find that you can't breathe when you drink enough. ........