I support it because he said that organ degeneration and connective tissue adhesion do exist, and he also emphasized the importance of prevention. From this point of view, I agree.
However, what I want to say is: I'm afraid this friend equates fitness with building beautiful muscles. I'm more daring to guess: does this friend, like many ordinary people, think that only going to the gym, picking up dumbbells and lifting barbells is fitness?
If you really think so, like him, I will say that you are wrong, at least most of them. Going to the gym to press iron (please forgive me for using the most popular expression) is just a form of fitness. Real fitness actually includes two or three kinds: cardiopulmonary training, resistance training (strength training) and physical and mental exercise.
Cardiopulmonary training is aimed at the cardiovascular system and respiratory system of human body, while resistance training is resistance training. The resistance here can be the weight of the human body, that is, the training against gravity, or the equipment, such as dumbbells, barbells, equipment load and so on. Physical and mental exercise is a highly concentrated physical activity, such as Tai Ji Chuan, yoga, martial arts, Pilates, Qigong and meditation.
Generally speaking, fitness can bring people many benefits, which are related to the prevention or treatment of most major diseases. If you compare exercise and fitness to medicine, it is the most common medicine in the world and a good medicine.
Regular exercise and fitness can bring you these benefits: improving cardiovascular function, lowering systolic and diastolic blood pressure, reducing weight and body fat, improving blood lipid, improving blood sugar control, reducing anxiety and depression (which makes you healthier psychologically), enhancing happiness, reducing the incidence of various cancers (such as colon cancer, breast cancer and prostate cancer) and reducing the incidence of osteoporosis. Epidemiological research shows that the life expectancy ratio of people who exercise and keep fit regularly.
Let's popularize the specific benefits of fitness in a little detail. We don't need to know so much about cell structure. We just need to know the benefits of exercise and fitness to the body system. A correct understanding of the benefits of fitness will help you change your concept, accept and like exercise and fitness.
(A) the benefits of cardiopulmonary training
In fact, for ordinary people, especially middle-aged people over 40, cardiopulmonary endurance is very important. Nowadays, more and more people are sedentary or have a bad diet because of various reasons in their work and life, either overweight or obese, or always feel overwhelmed. Why do they always feel tired, tired, tired? Your cardio-pulmonary endurance is too poor. What is cardiopulmonary endurance?
Cardiopulmonary endurance, also known as aerobic activity or aerobic fitness, is the greatest ability of the heart, blood vessels and lungs to deliver oxygen and nutrition to the active muscles of your body, thus generating energy. In the simplest case, if you walk, do you have to participate in most of your muscles, and the energy supply is insufficient, will you soon feel difficulty breathing, leg weakness, pain and so on?
The stronger a person's cardiopulmonary endurance is, the more physical labor he can do, and he won't feel tired, because cardiopulmonary exercise belongs to the whole body and needs a lot of muscle groups, thus improving cardiopulmonary endurance. More specifically, cardiopulmonary training is beneficial to the physiological adaptation of the body system.
(1) Muscle system: Low-intensity endurance cardiopulmonary exercise can promote the adaptation of type I muscle fibers (slow-contracting muscle fibers), including the increase of the size and number of mitochondria in cells and the growth of more capillaries around muscle fibers, thus enhancing the transport of oxygenated blood to muscle fibers.
(2) Cardiovascular system: With the increase of blood volume in endurance training, the cardiac muscle will be thickened and the ventricular volume will increase, which will help the heart to output more blood to the muscles, that is, the cardiac output will increase, and cardiac output = stroke volume * maximum heart rate will not increase with training.
(3) Respiratory system: With regular exercise, the muscles of respiratory system will adapt to the increase of alveolar ventilation. You have more ventilation, longer ventilation time, and your body's ability to take in oxygen is enhanced.