As for how long you should swim at a time, it is generally recommended to swim for 40-60 minutes. Swimming for too long will lead to fatigue, and swimming for too short will not achieve the exercise effect. Generally speaking, the best swimming effect is to swim until you feel relaxed but not tired.
Extended data:
People swim in the water, paddle with two arms, kick with two legs at the same time, and all the muscles of the whole body participate in sports, which can make the muscles of the whole body get a good exercise. In addition, when swimming, because the density (in other words, resistance) and heat transfer performance of water are greater than that of air (the heat transfer coefficient of water is 26 times greater than that of air,
That is to say, at the same temperature, the speed of heat dissipation in water is more than 20 times faster than that in air, so the human body consumes more energy in water than on land.
These energy supplies are supplemented by consuming sugar and fat in the body. Regular swimming can gradually remove excess fat from the body without getting fat.
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.
References:
Baidu encyclopedia-swimming to lose weight