2. From the point of view of protecting joints, swimming can reduce the pressure on waist joints and knee joints. These two joints are most likely to be damaged by overweight people. The swimming posture determines that these joints do not need to be impacted by the ground. Running will greatly increase the pressure on these two joints. But swimming too often will increase the chance of shoulder joint wear. Especially freestyle and backstroke, because these two strokes have a great rotation of the shoulder joint.
3. From the overall weight loss effect, swimming, especially swimming in cold water, is stimulated by cold, which will protect the body from storing fat to keep warm, thus causing a great increase in appetite after exercise, and then unconsciously increasing calorie intake. Therefore, the overall fat reduction effect is not as good as running. Unless you stay awake and control your appetite. Or you have the habit of keeping a diet diary. Of course, this requires a strong will to complete.