What are the benefits of exercise to health?

Swimming is a whole-body exercise. If swimming is correct, almost all muscles of the human body can participate in sports? Because water is much denser than air, it is more difficult to move forward in water than on land? In the floating state, the "heart position" and standing formed by the human body and the heart? Sitting? Walking is very different, so the heart load is not great when swimming? Because of the buoyancy of water, human joint tissues are hardly affected by gravity, and the joint load is very small? When swimming, do your limbs rub water? Squeezing is good for systemic blood circulation?

Athletes in short-distance swimming events need to consume a lot of creatine phosphate, while long-distance swimming events need to consume more oxygen and energy? Long-term exposure to chlorine in water enables athletes' eyes to adapt to this chemical without being stimulated as strongly as ordinary people? Because there is no need to rely on limbs to support the weight of the body, swimmers have less bone density, which is more conducive to achieving excellent results in swimming?

Swimming is not limited by age, and most people can participate? Swimming speeds up the heart rate and is good for blood circulation? Is the velocity of blood vessels such as femoral artery faster? These have a good health care effect on cardiovascular and cerebrovascular diseases? But because the limbs do not need to support the weight, the preventive effect on osteoporosis is not very good?