In the official competition, FINA requires that the swimming pool be divided into several lanes. What is the width of each lane?

(right) 1. In the 8-lane swimming pool competition, the athlete or relay team with the best performance in the same group is arranged in the fifth lane, and other athletes or relay teams are arranged in the order of 4, 6, 3, 7, 2, 8, 1 lane.

(Wrong) 2. In individual medley competition, the order of the four postures is butterfly, breaststroke, backstroke and freestyle.

(Wrong) 3. The swimming pool in the official competition is 50 meters long and each lane is 2 meters wide.

(right) 4. In the medley relay, freestyle swimmers can use any swimming style.

(Wrong) 5. An athlete who swims out of this lane in the competition may not be convicted of a foul as long as it does not interfere with or hinder the normal competition of other athletes.

(right) 6. The key to controlling the diving angle is to control the degree of the bow, the direction of the stroke, and the hand shape and direction when the arm is extended forward.

(wrong) 7. Reverse breaststroke is a swimming posture in which the body is lying on the water, the arms are paddling backwards at the same time, and the legs are kicking the water up and down at the same time.

(Wrong) 8. Freestyle refers to the crawl position.

(right) 9. There is a dark lane marking line at the bottom of each lane, which provides reference for athletes to keep a straight line and judge the turning distance when swimming in.

(Wrong) 10. In case of drowning in natural waters, you can jump into the water first to rescue your head.

Fill in the blanks (2 points for each blank, 30 points for * * *)

1. Practical swimming refers to swimming activities that directly serve military life and production.

The events of the International Amateur Swimming Federation include swimming, diving, water polo and flower swimming.

Wait for the four major items.

3. The standard swimming pool is 50 meters long, with 8 lanes, and the table top of the starting platform leans forward no more than 0.

The resistance of water is many times greater than that of air, so it is much more difficult to walk in water than on land.

5. The breaststroke leg technique consists of four parts: leg adduction, leg eversion, pedaling and sliding.

6. When swimming in natural waters, if you encounter a whirlpool and get entangled in it, you should immediately stay on the water surface and quickly leave the whirlpool area with or posture.

7. If the drowning person's breathing is weak or has stopped breathing, on the one hand, he should call the emergency center to rescue him, on the other hand, he should immediately carry out artificial respiration and cardiac compression on the spot until the drowning person wakes up.

Third, short answer questions (* *10, choose 2 questions)

1. What are the technical requirements for treading water with both legs at the same time?

2. Why do people often use freestyle as a sign to measure a country's swimming level?

Freestyle is the fastest swimming posture in the world, with reasonable structure, labor saving, small resistance and even forward speed. It has great practical value and is suitable for fast swimming near the target, crossing rivers and long-distance swimming. Freestyle has the most events and plays an important role in swimming competitions. At present, the men's swimming record is 16, of which freestyle accounts for 7; The women's swimming record is 15, and freestyle accounts for 6 events. In addition, freestyle also includes individual medley and medley relay. It can be said that freestyle is the basic event of competitive swimming, and it is often used as a symbol to measure a country's swimming technical level. So some countries with high swimming level attach great importance to freestyle.

3. How to prepare before swimming?

Necessary preparatory activities, such as gymnastics, should be done before entering the water, which can improve the state of various organs and systems of the body and improve the excitement and flexibility of the nervous system. After preparation, the activities of heart and respiratory organs are strengthened, the process of blood circulation and substance metabolism is accelerated, the strength and elasticity of muscles are increased, the range of joint activities is expanded, and the flexibility is improved. These changes in the body help the body adapt to the needs of swimming activities more quickly. At the same time, it also has a certain effect on preventing muscle cramps and strains. Some people are prone to dizziness, nausea, palpitation, muscle spasm and strain when they get into the water without being prepared for activities.

Different swimming postures have different contents and amounts of warm-up activities. But the basic requirement must be to make the muscles and joints of all parts of the body move, especially the parts with heavy burden in swimming, such as the lower limbs of breaststroke, knee joint, upper limbs of freestyle and shoulder joint. Generally, you can do a few radio exercises or run and jump, and you can also do some actions such as rowing your arms and kicking to move your neck, shoulders, waist, hips, knees and wrists. In addition to physical activities, you should also wipe your face, back, chest and thighs with water before entering the water to gradually adapt your body to the stimulation of cold water.

Four. Question and answer (***45 points)

1. What should I do if I feel uncomfortable while swimming?

Leg and toe cramp: first take a breath and float on the water, hold the cramped toe with the hand opposite the cramped leg and pull it in the direction of the body with your hand; At the same time, press the cramped knee with the other palm to help straighten the calf and make it recover.

Leg cramp: first take a deep breath and float on the water, bend and cramp the leg, then hold the calf with both hands and stick it to the thigh and shake it.

2. What are the promotion effects of swimming on college students' health? (15)

1. Enhance myocardial function. Enhance resistance 3. Install body 4. Enhance lung function

Swimming can enhance physical fitness. Secondly, learning to swim is also a skill we have mastered. In later life, we may encounter more or less unexpected events, such as drowning. At this time, swimming is a very important survival skill.

3. What do you think of the one-year swimming class? (15)