Swimming costs more. Because swimming needs to fight against the loss of body temperature. You don't exercise in water, and your body consumes more than land. But swimmers will have thicker subcutaneous fat because they have to fight against low temperature. Therefore, swimmers generally do not have too low body fat. Swimming is better for overweight and obese people. Boxing is more suitable for thin people who want to lose weight further. After all, staying in water for a long time can lead to hypoglycemia or hypothermia without a certain amount of fat accumulation.

It is best to combine a variety of sports. Boxing, swimming and other sports cross each other. After all, there is only one sport, which will be boring.