Excessive exercise impairs immune function and affects health. This is because people will produce more hormones such as adrenaline and cortisol during strenuous exercise. When these hormones are increased to a certain amount, the ability of immune organ spleen to produce white blood cells will be greatly reduced, and the activities of A cells, B cells and natural killer cells (NK cells) in lymphocytes will be greatly reduced, among which natural killer cells can be reduced by 35%. If you exercise too much, you will feel sick, chest tightness, shortness of breath, flustered and very tired.

Fitness is a kind of exercise, such as all kinds of unarmed aerobics, rhythmic gymnastics, rhythmic gymnastics, and all kinds of self-resistance movements. Gymnastics can enhance the strength, flexibility, endurance, coordination and control of all parts of the body, thus making the body strong. If you want to relieve stress, exercise at least three times a week.

Swimming, brisk walking, jogging, cycling and all aerobic exercises can exercise the heart. Aerobic exercise has many benefits: it can exercise the heart and lungs, enhance the function of the circulatory system, burn fat, increase vital capacity, lower blood pressure, and even prevent diabetes and reduce the occurrence of heart disease.

The American College of Sports Medicine suggests that if you want to know whether the intensity of aerobic exercise is appropriate, you can test your heart rate to reach 60%-90% of the highest heart rate after exercise. If you want to lose weight through aerobic exercise, you can choose low to moderate exercise intensity and extend exercise time. This method consumes more calories.

References:

Baidu encyclopedia-fitness