1. Improve the function of cardiovascular system
The cardiovascular system includes what we know as the heart, lungs and blood vessels responsible for transporting inhaled oxygen to muscle cells. Swimming needs more energy to overcome the resistance of water, so as to speed up the heart rate and increase the cardiac output. After swimming for a long time, the heart volume increases with exercise, the myocardial contraction is strong, the quiet heart rate slows down, the stroke output increases, the blood vessel wall thickens, the elasticity increases, and the efficiency of the cardiovascular system improves.
In addition, when swimming, the human body is in the supine position, and the pressure of water on the skin has a * * * effect. Therefore, the blood of limbs, especially lower limbs, flows back to the heart more easily than when standing upright on land. Moreover, the resistance of water makes it difficult for muscles to exert explosive force as on land. These characteristics are very suitable for middle-aged and elderly people to exercise, which can not only enhance their physical fitness, but also avoid accidents caused by excessive exercise.
2. Improve the function of respiratory system
One of the main characteristics of water is incompressibility. Because the density of water is more than 800 times higher than that of air, the pressure on people in water is far greater than that in air. This is also the reason why beginners have difficulty breathing in the water. As the pressure in the chest and abdominal cavity increases in water, it forces the respiratory muscles to breathe with greater strength. Therefore, regular swimming can increase the strength of respiratory muscles and improve the function of respiratory system. The most obvious example is the value of vital capacity. A swimmer's vital capacity can reach 4000 to 6000 ml, or even 7000 ml, while the average person only has 3000 to 4000 ml.
3. Improve the ability of the muscle system
Swimming is a whole-body exercise, which can mobilize more muscle groups to participate in metabolism and energy supply than other sports.
Although swimming can't build thick and bulging muscles, it can improve the strength and coordination of many muscles, especially the muscles of trunk, shoulder straps and upper limbs. Because swimming in water needs to overcome great resistance, and swimming is a periodic exercise, long-term exercise can improve muscle strength, speed, endurance and joint flexibility.
Another great advantage of swimming is the improvement of flexibility. This allows people to continue swimming when they are unable to engage in other sports activities due to age restrictions. Because swimming has a wide range of physical activities, people who swim often become more flexible and soft. Moreover, the correct swimming technique requires the muscles to stretch before the contraction force, which is conducive to continuously improving flexibility and strength.
4. Make the proportion of all parts of the body more reasonable, thus shaping the body shape.
If you often watch swimming competitions, you will definitely admire the rounded, slender, symmetrical muscles and strong figure of swimmers. Due to the influence of muscle working mode, swimmers are generally slender, with broad shoulders, flexible waist and well-proportioned figure. Maybe someone will say, I want to lose weight by swimming, why not? In fact, if you want to lose weight through exercise, you must reach a certain intensity, persist for enough time and persevere. If you only fish for three days and swim leisurely in the swimming pool for two days, of course it won't help. If you run, ride a bike or do any other exercise in this way, the result will be the same.
5. Improve the thermoregulation mechanism
Because the temperature of water is generally lower than that of air, and the thermal conductivity of water is dozens of times stronger than that of air, people dissipate heat much faster in water than in air. Regular swimming can improve the ability of body temperature regulation, so as to be more able to withstand the changes of external temperature. Especially in winter swimming, this improvement is particularly obvious.
6. Disease prevention, treatment and rehabilitation
Because the water is very cold, long-term swimming exercise can enhance the body's cold resistance and adaptability to the environment, prevent colds and other diseases, and make the body stronger day by day. Because the body lies flat when swimming, plus buoyancy, the spine can be fully stretched, which has a certain rehabilitation effect on some spine patients. Swimming can also be used as exercise prescription to treat some chronic diseases, such as chronic gastrointestinal diseases or chronic bronchial asthma. For some people who are not suitable for upright exercise, such as obese patients, if they take running and other ways, their legs and feet will be overloaded due to gravity, which will easily lead to injuries. At this time, swimming is a good alternative to exercise.
7. Hone will, cultivate attention quality, and promote mental health and intellectual development.
Learning to swim needs to overcome certain difficulties. For example, novices are easily afraid of water, and their strangeness to the water environment makes them afraid. The process of learning to swim is to overcome difficulties such as fear, cold and fatigue, which is a good exercise for people's will. Modern people seek to return to nature, more and more people like to swim in open waters, enjoy the fun of nature in rivers, lakes and seas, and many people insist on winter swimming all the year round, which have tempered people's will and inspired people's spirit.
Swimming is also good for the development of intelligence. The flowing characteristics of water put forward many special and subtle requirements for swimming technology. The process of mastering swimming skills is a process in which the nervous system and muscles are fully coordinated, which requires a special "sense of water". All these are beneficial to the nervous system, and those who insist on swimming exercise will certainly benefit from it.
My aunt took me swimming. My aunt is a PE teacher. Her best sport is swimming.
My aunt's height 166 cm. Although she is 39 years old, her figure is all said, and she looks like a girl under 30 years old from a distance.
Every summer, my aunt always takes my sister and me to the swimming pool.
At this time, I can appreciate my aunt's specialty.
She likes to wear a black bathing suit when swimming, just like a black mermaid swimming in the water, with light and free movements.
She is proficient in four swimming techniques. She swims freestyle with agility and quickness, flapping her arms rhythmically on the water and making white waves. If you trot along the shore, you may not catch up with her speed.
When she backstrokes, she is very comfortable, just like a boat gliding gently on the water.
She swims in harmony with the frog, just like a lively little frog.
Butterfly stroke is the most difficult stroke for ordinary people to master.
It needs a soft body. My aunt's body fluctuates up and down when swimming butterfly, and her lines are soft, which makes my heart itch. Unfortunately, I haven't learned it yet.
Another skill of my aunt is that she can find things in the water without swimming glasses.
I remember one time.
My swimming glasses fell into the water, and I can't find them. My aunt plunged into the water and found it for me in the blink of an eye.
The most amazing thing is that once a tourist's ring accidentally fell into the pool, and finally her aunt who sneaked into the pool found it and helped her find it.
My aunt's swimming skills are well known. Every summer, many students come to learn swimming from her.
I really hope that in the near future, I can become a swimmer like my aunt.
About 350 words about swimming In the summer vacation of the second grade, my parents and I went swimming in the swimming pool in Agile Community.
I put on my swimming trunks, goggles, swimming cap and floating board in my hand, and came to the swimming pool happily.
The weather is very hot and the temperature is very high.
Dad taught me to do warm-up activities and stretch leg press first.
I can't wait to jump into shallow water like a frog
Dad taught me to put my arms forward, hold the floating board, float on the water as a whole, and draw water with my feet.
At first, my movements were not coordinated, and my father said kindly, "Baby, don't worry, keep training, and you will swim soon."
"Dad taught me patiently and hand in hand. Slowly, I can swim.
I insist on swimming every day, sometimes twice a day, in the afternoon and evening.
Several pairs of goggles are broken and my skin is tanned. One day my mother looked at me and said with a smile, "Baby, you are really a little black cat!" " "Now I can swim around happily in the deep water like a fish, without floating boards.
Dad not only taught me to swim, but also taught me a truth: "Nothing is difficult in the world, as long as you are willing to climb!" " " ...
My parents go swimming with me. The burning sun shone on us this afternoon, just like frying oil.
Therefore, my aunt and I decided to go swimming in Nanhai swimming pool this afternoon.
Because you can't swim, you should bring a swimming ring.
After getting everything ready, I got on the bus.
Come to the swimming pool. It is crowded here.
After we bought the tickets and went in, I couldn't wait to put on my bathing suit.
Get ready to go into the water because I can't swim.
So my cousin taught me to do the movements first. My cousin asked me to open my hand first and then retract it, and so did my feet.
In this way, I practiced many times and finally got it.
So, my cousin taught me to dive again.
Then tell me not to breathe and close my eyes and mouth.
I practiced this movement many times, and finally, I practiced it.
So I swam around, and my cousin watched and repeatedly said that my movements were very standard.
After listening to praise, my heart is sweeter than eating honey.
Therefore, my cousin is also going to swim once.
But as soon as he swam over, he heard the notice that he was going to close the door.
So I quickly changed my clothes and went out.
I still can't bear to leave, and I'm still thinking about the picture swimming in my mind.
After a while, my elder sister-in-law said that Chen Dan had arrived home, and I just came to my senses, so I still look forward to going swimming every day.
Go to the swimming pool to learn swimming composition 650 words The long-awaited summer vacation has finally arrived.
I stuffed my schoolbag, textbooks and the like into the drawer.
I'm busy. My father is back.
As soon as he entered the door, he smiled and said to me, "Summer vacation is coming again. Remember what you said? " "What words?" I asked casually.
"Didn't you bet that you couldn't swim after graduating from primary school, so you wrote your name backwards?" "What's the hurry, haven't had a summer vacation.
In a few days, I will learn from my cousin.
"I answered confidently.
On this day, my cousin and I came to the swimming pool.
There are many people in the swimming pool, and everyone is in high spirits, but my heart is at a loss.
My cousin gave me a look and asked, "Are you afraid?" I said unconvinced, "I'm not."
Didn't you say swimming was not difficult to learn? ""of course, but first of all, you have to be not afraid of suffering.
In fact, everything is like this.
"Listen to my brother, I wittily stick out your tongue, thinking, my brother is quite like a little teacher.
When I got to the pool, I crustily skin of head and got out of the pool. My brother asked me to learn "stuffy water" by holding the railing by the pool.
I asked, "Can I open my eyes in the water?" "yes.
Take a deep breath first and then bury your face in the water. Come on, give it a try.
"I hesitated with a frown, stuffy into the water that how uncomfortable.
Brother smiled: "I said you were a coward!" " "I was angry and said loudly," Don't look at the people under the door! Look at me.
"I took a deep breath, willy-nilly, lowered my head and buried my face in the water.
Hey, water doesn't seem so terrible anymore.
I tried to open my eyes and saw a piece of blue water.
I just looked up and said to my brother, "What's the matter? Look at me, coward! " "Don't be too happy.
Next, learn to draw water.
"Brother let me still grab the railing and draw water with my legs.
After only a few hits, I lost my strength.
My brother told me to have a rest.
I thought, "I must practice hard. If I am afraid of hardship and fatigue, I will lose to my father. "
"So, I pouted:" Don't rest, practice again! " My brother patted me on the shoulder lovingly, and we continued to practice while joking. After half a month, I made great progress in swimming. I learned not only freestyle, but also breaststroke.
I proudly said to my father, "Dad, you lost.
Dad smiled brightly: "Where there is a will, there is a way."
You are not afraid of hardship, and you are determined. Of course, dad lost.
"Listen to my father, my brother and I will smile.
Diary of summer vacation of senior one: Going swimming Thursday, July 29th, 250 It's sunny today, and the sun baked me into Beijing roast duck.
Grandpa said, "Let's go swimming.
"I hitched like a pony to get a swimsuit.
Grandpa started with us and will arrive soon.
I can't wait to put on my bathing suit and jump. My grandmother pulled me and insisted that I bring a swimming ring.
I came down with a swimming ring.
I walked into the cave slide. I slipped and drank a lot of water.
I came to another big dance. The ball is transparent and obvious from the inside out. I took a step in the ball and fell down, but I couldn't stand it. I'm not playing.
I came to the big swimming pool, and the waves came to the big swimming pool and turned me over, but I floated up again.
I started swimming. I rowed my hands to both sides and my feet leaned back. The water is cold and comfortable.
Paddling, I took off my swimming ring and swam. Unexpectedly, my grandmother found me. I jumped into a small swimming pool to swim. The water level here is very low. The water is neither too cold nor too hot. I threw away my swimming ring and wanted to go swimming by myself. Unexpectedly, my grandmother found me again. My grandmother took me and said, "Stop swimming, stop swimming, let's go home."
"Grandma took me away.
Today, I packed my things in the study.
I suddenly turned out my previous photo album and saw a photo on the beach, which reminded me of the first time I went swimming in the sea.
I was seven years old that year. On a sunny afternoon, my parents and I went swimming in the sea.
When I got off the bus, I saw the endless blue sea and golden beach.
Suddenly feel relaxed and happy. I quickly put on my bathing suit and snatched the swimming ring from my father.
While running to the seaside, I thought: I'm going to swim in the sea! When I get into the water, it's very cool. My father swam over to me and said, "It's no good holding a swimming ring all day. Come on, dad will teach you to swim. "
"Say that finish dad took my swimming ring away.
He grabbed my hand, but I was afraid of choking on the water, so I struggled desperately and kept kicking my legs. Slowly, I felt my body sinking.
Dad quickly helped me up and said with a smile, "How can you swim out of the sea like this!" " "I was concerned, so I quickly grabbed the swimming ring and drifted to the beach with difficulty.
My mother handed me an apple and comforted me by saying, "Don't be afraid. Dad will protect you. Eat the apple and continue to practice. " .
"I ate an apple and thought," Yes, I really should learn to swim.
After a while, after eating the apple, I rushed down again and asked my father to teach me. Father said patiently, "when swimming, relax yourself and don't be nervous."
Learn to dive first! "So I followed my father, but I still dare not, action. ...
Composition of Nanchi Park 350 words Nanchi Park in spring is very beautiful, especially Nanchi Park.
I still remember that at Christmas, the weather turned cold and many people stayed at home.
Spring has come, the spring breeze evokes the life of the earth, the sun shines on the earth and the park becomes warm.
The little animals excitedly ran to the Woods and held a party along the park path.
The earth is full of vitality, with flowers, roses, chrysanthemums and famous bauhinia flowers everywhere.
When people wake up in a sweet sleep, they go to the park to play. Some are parents, some are children and some are elders.
The park has become very lively.
At this time, in the joyful laughter, there was the sound of a puppy barking. It turns out that there is a lovely puppy playing with a beautiful kitten.
Birds are flying in the sky and ducklings are swimming in the river.
People are talking happily in the park. At this time, people picked up umbrellas because it was raining.
After a while, the rain stopped, people put away their umbrellas, the earth became wet, and a few drops of dew appeared on the flowers, as if the stars were twinkling in the sky.
Soil is rich in nutrients, which is suitable for the growth of grass and makes the air quality of the earth fresh.
Prevent drowning and cherish life. Summer is coming, and the weather is very hot. The best way to escape from summer is swimming.
But swimming is dangerous. I don't know how many people lose their lives because of swimming every year.
The following is such a tragic story about drowning.
June 25th, 2008 is a sad day. A boy named Dai Mingming 13 years old drowned forever.
That day, the weather was particularly hot. He and two companions went swimming in the fish pond to cool off the heat. At first, everyone swam in shallow water. Slowly, Dai Mingming, who is good at water, let her guard down. He swam to the deep water excitedly.
A few minutes later, the two companions couldn't find Dai Mingming anywhere.
They climbed ashore, looked around and shouted, but they didn't find Dai Mingming.
At a loss, the two companions quietly packed their schoolbags and went home secretly.
When he got home, Dai Mingming's companion told his parents what had just happened. The parents of the two families groped by the fish pond, saw Dai Mingming's schoolbag still by the fish pond, knew something was wrong, and called 1 10 to call the police.
When Dai Mingming was salvaged from the deep water of the fish pond, he was already dying.
This incident has taught us a profound lesson. I would like to remind you that children must be watched by their parents when swimming. People who can't swim had better not go into the water, especially in places with cold water depth, such as fish ponds and reservoirs.
Go out swimming in time and take a walk together, so that we can take care of each other. Be sure to remember the lesson of blood, cherish life and prevent drowning.
To prevent drowning, we should do the following: 1. People who can't swim should never play by the water alone. Don't play with friends without adult supervision.
2. Do full-body exercise before swimming, fully exercise joints and relax muscles to avoid cramps, sprains and other accidents after entering the water.
If you have a cramp, be calm, don't panic, and help yourself while shouting.
Common is calf cramp. At this time, you should do backstroke, hold your toes with your hands, push your calves forward hard, and try to get close to shallow water or shore.
3. Pupils should take part in group activities when swimming, instead of swimming alone, it is better to be led by adults.
Swimming time should not be too long. You should go ashore and rest for 20 to 30 minutes, and each swimming time should not exceed 2 hours.
Pupils should not swim in too cold water. If they feel that there is a big difference between the water temperature and the body temperature, they should slowly enter the water, gradually adapt to it, and try to reduce the number of times to reduce the * * * effect of cold water on the body.
5. Pupils generally don't dive. They can play water polo in the water, but they can't make fun of or play pranks, and they can't hold down their peers, pull their peers or dive to sneak up on their peers.
Students who just learn to swim can't do this.
6. Swimming should be carried out in the swimming area with safety protection zone, and swimming in the non-swimming area is strictly prohibited.
Children in rural areas should choose areas that are familiar with underwater conditions.
7. People who take part in swimming must be in good health. Students with the following diseases are not allowed to swim: heart disease, hypertension, tuberculosis, hepatitis, kidney, malaria, severe arthritis, etc.
Female students can't swim during menstruation, and students with pink eye and otitis media can't swim.
8. It is very dangerous to swim in the open air and encounter heavy rain. You should go ashore immediately and go to a safe place to avoid the wind and rain.
Please indicate the source for reprinting. What is the function of swimming?