1. What are the swimming postures?
First, roll and turn:
Including crawl, backstroke forward roll, backstroke semi-roll and various postures roll. This kind of turning is rotating around the horizontal axis, vertical axis or front and rear axis, and turning at the edge is faster. In particular, the forward roll and turn of freestyle, the hand does not touch the pool wall, so the turn speed is the fastest, but the action is more complicated and difficult to learn.
Second, swing and turn:
Include crawl, breaststroke and butterfly. When crawling and swinging, the body rotates around the longitudinal axis and the front and rear axis; When breaststroke and butterfly turn around, the body rotates around the horizontal axis, vertical axis and front and rear axis. They turn their heads on the water, swing their arms in the direction of rotation, and inhale while their mouths are out of the water. Therefore, it is labor-saving and a basic turning method.
Third, the translation turn:
Including backstroke, freestyle and breaststroke. This kind of turn, the body rotates around the front and rear axes, and the action is relatively simple and easy to learn, but the turning speed is slow.
Although some movements are difficult to learn and some are easy to learn, they are all gorgeous. As long as you learn it, you will become the focus in the swimming pool.
2. What are the benefits of swimming?
1, improve the function of cardiovascular system.
If you persist in swimming for a long time, the heart volume will increase by exercise, the myocardial contraction will become stronger, the quiet heart rate will slow down, the stroke output will increase, the elasticity of blood vessel wall will increase, and the efficiency of cardiovascular system will improve.
2. Improve the function of respiratory system.
Because the density of water is more than 800 times higher than that of air, people are under much greater pressure in water than in air. Due to the increased pressure in the chest and abdominal cavity in the water, the respiratory muscles are forced to breathe with greater strength. Regular swimming can increase the strength of respiratory muscles and improve the function of respiratory system.
3, improve the ability of the muscle system
Swimming is a whole-body exercise, and long-term exercise can improve muscle strength, speed, endurance and joint flexibility. Correct swimming techniques require muscles to stretch before contraction, which is conducive to continuously improving our flexibility and strength.
In the process of swimming, it produces resistance with water and has the effect of losing weight. Long-term swimmers are generally slender, with broad shoulders, flexible waist and well-proportioned figure.
4. Improve the thermoregulation function.
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 lose far more heat 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.
5, disease prevention, treatment and rehabilitation
Due to the stimulation of cold water, 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 and 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 are easily injured due to the heavy burden of gravity. At this time, swimming is a good alternative exercise.