Swimming and running are both aerobic exercises, which are beneficial to exercise, enhance physical fitness and exercise cardiopulmonary function. Swimming is still a bit dangerous, whether it is drowning or cramping, it will put swimmers in a dangerous state. Swimmers in danger do not have the conditions to leave immediately, so swimmers should choose to swim when they are full of physical strength. If you are tired, cramped, or uncomfortable, you can stop running at once, and your autonomy is much higher than swimming.

Swimming is better, first, it doesn't hurt your knees, second, it is better for your lungs, and there is no smog ... swimming is good for your skin, and it is better if you have the conditions.

Warm-up before doing any exercise, which is of great benefit to the movement and can avoid physical strain or sprain, and running is the best warm-up exercise before doing anything. However, it should be noted that you can't swim directly after running, and softness is very harmful to your body, because the skin pores are relatively open at this time, and direct contact with cold water is very harmful to your body. After running, all the organs are working, so you can go swimming after the sweat disappears, which will have a good effect.

Running and swimming are very healthy and effective ways to keep fit (bodybuilding is not discussed here). Their main advantages are to improve heart and lung function and exercise most muscles of the whole body. Running, especially jogging or middle-speed running, has no requirements on the venue and weather, is easy to practice and has less probability of accidents than swimming. But if you don't do enough upper limb exercise for a long time, it may make people look thin and not strong.

Swimming takes a long time, and it is difficult to take part in it without a certain amount of free time, from starting to swimming pool (rivers, lakes and seas) to taking a shower and changing clothes after starting. Outdoor swimming is strict with the weather, which is not easy to last for a long time (related to water) and has a high accident probability. Advantages are coordinated development of the whole body, long-term persistence, easy to form an inverted triangle shape (which may cause trouble to women), balanced development of muscle endurance and explosive force, and no joint injury.