Swimming is a kind of aerobic exercise, which can drive the muscles of the whole body in the process of swimming, and the time spent by the general amateur population in swimming 1000 meters without resting continuously is about half an hour. The data of the “Nutritional Dietary Guidelines for Chinese Residents (2016)” show that a 66 kg male and a 56 kg female consume an average of 264 kcal and 224.1 kcal respectively for a half hour of freestyle or backstroke, where 1 kcal = 1000 calories. However, the actual number of calories consumed in 1000 meters of swimming cannot be generalized, because the calories consumed are related to various factors such as swimming speed and personal weight. For the same distance, the faster the swimming speed, the more calories will be consumed. The heavier you are, the more calories you will burn for the same exercise. Also related to the swimming position, butterfly than freestyle and breaststroke to burn more calories. In addition, if you swim 1,000 meters with a rest period in between and continue swimming, the calories consumed will be less than if you keep swimming 1,000 meters. In addition, swimming consumes relatively more calories compared to other exercises on the ground, such as jogging and cycling. Because the thermal conductivity of water is much higher than that of air, the amount of calories consumed by exercise in water is much higher than that consumed in air at the same temperature. And when swimming, the body movement and limb swing to withstand the resistance of the water, increasing the intensity of the movement, so it will also consume more calories than the general exercise.