It depends on the amount of exercise. If you want to lose weight quickly, you should swim at least 800 meters breaststroke or more than 200 meters freestyle every day, and the speed should not be too slow (in other words, you can make up for it by increasing the distance, except in winter, and you can reduce the distance with the decrease of water temperature). If you are too fat, it is also necessary to supplement your diet. As the saying goes, fat people are eaten. Hehe, in fact, we all know that saying "Hey, I'm fat, and drinking boiled water will make me fat" is really a cover for my gluttony.