(1) translation type

Swimmers should pay attention to the preparation of the turn when swimming across the backstroke turn sign line (usually the flag rope hanging on the swimming pool, 5 meters away from the end of the turn). When touching the wall, the head should be tilted to the left front, and the head and shoulders should swing left around the coronal axis like a rudder, driving the trunk and lower limbs to swing right.

After the right arm touches the wall, bend your elbow to push the pool wall to the right, help your head and shoulders turn left, bend your knees at the same time, and use your hip joint to drive your legs to swing to the right;

When your feet touch the wall of the pool, put your arms together, straighten them in front of your head, and push your legs back from the wall. After the body glides in a streamlined way to catch the backstroke leg or the anti-dolphin leg, the head comes out of the water to catch the stroke.

(2) Rolling type

Backstroke forward tumbling is a relatively easy foul action in swimming competition, which needs careful understanding and repeated practice. When the body swims over the backstroke turn sign line, it begins to adjust the rhythm of the action and prepare to turn around. Before rolling forward, the body turns to the prone position around the longitudinal axis.

Take turning left as an example. After the last stroke of the right hand, the left hand quickly strokes for a short distance, and the body rotates around the longitudinal axis.

When the body turns to the vertical position, the left hand stroke basically ends. The right hand bends from the side of the body from the air to the front of the head. At this time, the body is basically in a prone position. Pull back with your right hand to help roll, bend your head and knees, and roll back and forth around the coronary axis. When your legs are thrown to the pool wall, put your arms in front of your head, put your feet against the pool wall, bend your knees, and your body is in a supine position.

Then squat down a little, push your feet away from the pool wall, put your arms straight in front of your head, and slide in a streamlined way. Swimming is the same as turning horizontally.

2, butterfly, breaststroke U-turn technology:

(1) translation type

When swimming near the pool wall, you can't slow down. The last stroke of breaststroke is best to end with kicking, and both hands just reach forward and touch the wall of the pool. Butterfly stroke is best to end with moving arm or will end soon. When touching the wall, both hands should be on the same level at the same time.

Take turning from the left as an example. After touching the wall, both arms bend elbows at the same time, the body moves closer to the pool wall, and the right hand pushes the pool wall to increase the elbow flexion angle of the right arm.

And helps the body to rotate to the left around the longitudinal axis. Bend your knees when you rotate, and your arms will swing with the rotation of your body on the surface or underwater. After the calf and feet rotate about 180 degrees, the feet lean against the pool wall, the hands stretch forward, the head bends, and the body slides out of the pool wall from underwater. When the sliding speed starts to decrease, the breaststroke starts to stroke the arm length, and the butterfly starts to kick.

(2) Swing type

The best ending action of the journey is the same as above.

Take turning from the left as an example. When touching the wall, the left hand can be lower than the right hand.

After touching the wall, your elbows are bent and your body is close to the pool wall. Push the pool wall with both arms to make the head and shoulders out of the water, and make the upper body lean back. At the same time, as the body rotates to the left around the longitudinal axis, the left arm is pushed away from the pool wall and placed on the chest.

When the body rotates about 90 degrees and basically leans against the pool wall, the right hand pushes away from the pool wall to the right. As the body rotates to the left around the sagittal axis, the head and shoulders swing backwards from the water, and the legs continue to move closer to the pool wall until the feet are close to the pool wall. Pull the water up with your left hand under the water to make your body sink, then bow your head into a ball, and your body will sink into the water, and your feet will push hard to slide away from the pool wall.

3. Freestyle U-turn technology:

Freestyle turns usually start at an arm's length from the pool wall. The reasonable grasp of this distance is felt through constant experiments, but it is very important that it is one arm long; Because turning and kicking the wall should be done within this suitable distance, the body can't turn around too close and the legs can't push the wall too far.

There are four points to pay attention to when turning and pushing the wall:

(1) After kicking the wall, let your body slide out in a straight line close to the water surface, and don't bend, because the straight line has the shortest distance and the resistance close to the water surface is small; Maybe when you are a beginner, you will focus on turning around and not choking on the water, just grasp the distance.

(2) The process from the back before turning and pedaling to the prone water skiing after pedaling should be continuous, without sudden acceleration or deceleration, nor too slow or too fast, otherwise it will lose balance and deviate from the track; Repeat the experiment and control your weight.

(3) kicking. The easiest thing to ignore at this time is to keep a certain kicking speed. If there is no uniform kick support during the turn, it will lead to deceleration and may make the turn deviate from the straight line.

Only by maintaining a constant fast kick frequency can you keep your body streamlined and break the water, especially the last stroke. You may not be used to it at first, so you should always slow down and practice more, and don't let the kick of the last stroke affect your turn.

(4) Keep your head down behind the push wall and do some dolphin swimming. Remember to keep your head down, put your arms behind your ears and try to shrink your neck, so that the kinetic energy transformed by pushing the wall can make you slide farthest.