The principle of swimming diet is that the resistance of people to exercise in water is 12 times greater than that on land. When your hands and feet move in the water, you will definitely feel strong resistance, so the muscles of your back, chest, abdomen, buttocks and legs can be well exercised in swimming, and the well-defined muscles of swimmers are the best evidence. Swimming is also an intense sport. The heat transfer speed of water is faster than that of air, which means that people will lose heat quickly in water, and swimming will consume a lot of heat. Excess body fat will also "dissolve in water" quietly. In order to get a good exercise effect, you need to exercise in a planned way: beginners can swim for 3 minutes in a row, then rest for 1-2 minutes, and swim twice for 3 minutes each time. If you don't finish it with great effort, you can enter the second stage: swim continuously at an average speed of 10 minute, rest for 3 minutes, and do three groups at a time. If you still feel relaxed, you can start swimming for 20 minutes at a time until it increases to 30 minutes at a time. If you feel that the intensity is increasing too fast, you can follow your own acceptable rhythm. In addition, swimming consumes a lot of energy, so it is best to do it every other day to give your body a recovery time. When swimming, people's metabolism is very fast, and they can consume 1 100 kilojoules of heat in 30 minutes, and this metabolic rate can be maintained for a period of time after you leave the water, so swimming is an ideal way to lose weight. For thin people, swimming can actually make them gain weight, because swimming exercises muscles and increases their volume and weight. It can be said that swimming can make fat people swim thin and thin people swim fat, which can make everyone have a smooth line. In view of the above reasons, obese people can really take swimming as the main exercise to lose weight. But you must be prepared before swimming and pay attention to safety to prevent accidents. While swimming to lose weight, we should also pay attention to the phenomenon of "excessive recovery" after exercise. Simply put, in order to adapt to the improvement of the next stage of exercise, the human body consumes more energy after each exercise, which is a self-protection measure of the human body. Therefore, after swimming, people can often eat well and sleep soundly, and their intake of calories is replenished, even more than their intake. Therefore, if you don't pay attention to dieting, especially if you stop exercising after a period of time, it is easiest to make your weight exceed the original level. This is an important reason why many people fail to lose weight through exercise.