Clinical research shows that human diseases can be divided into functional diseases and organic diseases, and the two diseases have a common sign: symptoms get worse after exercise. The scientific definition of disease is: those who have clinical symptoms and get worse after exercise are called diseases. It can be seen that real diseases are unique to human movement, so "exercise can cure diseases" is a false proposition. Exercise can not only cure a disease, but also aggravate it.
On the contrary, human feelings that can be improved by exercise are not diseases. Whether the clinical symptoms are a response to the disease depends on whether the symptoms get worse after exercise. If it is aggravated, it is a disease response, otherwise it is not.
Then why do you say that illness requires exercise, and exercise can prevent and treat diseases? It is a scientific statement that exercise can prevent diseases, but it is an idealized misunderstanding of exercise that exercise can cure diseases.
Studies in many disciplines show that:
Exercise+time = improving human metabolism ≈ improving human immunity to some extent.
In fact, this is wishful thinking, and the real scientific correspondence is:
Exercise suitable for subjects+longer time = improving human metabolism ≈ improving human immunity.
If the way of exercise is not suitable for the subjects, exercise will be harmful to health. Even if the exercise mode is suitable for the subject, it will not be beneficial to health overnight, but it will take months or even years to benefit. Nowadays, people often mistakenly think that as long as they exercise, they will benefit.
Therefore, when choosing an exercise mode, the starting point is not suitable for one's health, but from liking, conformity, fashion or performance. Therefore, ridiculous sports styles with health signs can be seen everywhere in indoor and outdoor sports venues.
As far as the goal of health and longevity is concerned, the exercise with disease prevention function belongs to health preservation exercise, not professional competitive exercise. Therefore, flexible exercise mode should be the first choice. No matter how old you are, those rigid, strenuous and even overloaded exercises in the process of health preservation are not advisable. Because this kind of exercise not only can't cure diseases, but is harmful to health.