Swimming is the fastest way to consume calories in aerobic exercise, and it is also the most comfortable way to make you feel, because the conductivity of water makes you feel not particularly hot, and then sometimes you will be very tired, because your body is not adapted at first, but it does consume energy at the fastest speed, which is about 4~6 times that of running. Your constitution is different. For fat people, swimming will have better fitness effect, and for thin people, it will have better fitness effect.