There are so many benefits of exercise, which can promote muscle and bone growth, improve blood circulation, enhance the body’s adaptability, and psychologically relieve tension, stretch the body and mind, and cultivate the emotions. However, do you believe that exercise can kill tumors? I. Exercise: tumor killer? A foreign researcher published a study in an authoritative academic journal, and the result is: in mice, exercise can directly shrink tumors. The immune system of mice who insisted on exercise was stronger than that of mice who did not like exercise. This is just one study in mice. And some large-scale surveys on the population show that exercise is associated with a reduced incidence of many kinds of tumors. Second, tumor cells are produced in human body all the time, why not all people get tumors? It is because there is a system to clean up the garbage in human body – immune system. The garbage here includes bacteria, viruses, and also tumor cells that we are afraid of. In most cases, our immune system is in absolute superiority, just like a group of soldiers who love their job, even if they die with the tumor cells, they still want to nip them in the bud. As we grow older, the immune system ability decreases, or the tumor cells in our body increase, the immune cells are too late to clean up, and the tumor occurs. If you can’t change your age, then exercise! Exercise can stimulate the immune system, activate more immune cells, improve immunity and strengthen the body’s ability to clean up tumor cells. How to exercise for middle-aged and old people? As we grow older, all human functions are slowly going downhill. The choice of exercise should also be well thought out. How to do effective and healthy sports for middle-aged and old people? 1. Exercise programs Jogging, square dancing, bicycling, and hiking are all options. If you have bad knees, you can switch to walking or swimming. Taijiquan is a traditional Chinese sport that combines physical activity, breathing, and psychological conditioning, and is also a good medium to light aerobic exercise. 2. Exercise intensity The intensity of exercise can be monitored by heart rate (the number of heartbeats per minute). During exercise, remember not to let your heart rate exceed 170 minus your age. For example, for a 50-year-old person, it is better to keep the heart rate below 120 beats per minute. The duration of exercise usually lasts about 30 minutes, and the duration of physical activity depends mainly on the amount of exercise. Do a good preparation before physical exercise. People with chronic diseases, such as diabetes, hypertension, coronary heart disease patients, can first increase the exercise time in low intensity mainly, and then slowly increase the intensity of exercise. Middle-aged and elderly people, especially those with cardiovascular disease, should exercise under the guidance of a doctor. Before exercise should also do a comprehensive physical examination, so that doctors decide how to exercise to be safe. When exercising, you should do it gradually and pay attention to changes in your body at all times. It is best not to exercise when you have a fever, or other physical discomfort. Patients with cardiovascular disease should bring common emergency medicine, and diabetic patients should bring sugar cubes in case of accidents.