Exercise and cancer Many studies have shown that regular, periodic physical activity reduces the risk of many diseases, and increasing physical activity is gradually becoming an important means for people to improve their health. A large body of epidemiology has confirmed that exercise, especially moderate exercise (more than 2 hours per week), reduces the risk of tumors. A 34-year follow-up study in Finland found that the incidence of breast cancer among physical education teachers was significantly lower than that of linguistics teachers, leading to the conclusion that long-term physical activity can reduce the incidence of breast cancer. Further studies have shown that different forms of exercise, such as professional sports, walking and housework, can significantly reduce the risk of breast cancer. Exercise reduces the risk of breast cancer in adolescent, pre-menopausal and post-menopausal age groups. Lack of exercise is strongly associated with the development of tumors of the female reproductive system (ovarian cancer, endometrial cancer). One study found that the risk of ovarian epithelial cell carcinoma increased with increased sitting time. Most studies have concluded that light to moderate physical activity, regular exercise, and exercise for more than 90 minutes per day in postmenopausal women can reduce the risk of endometrial cancer. Exercise also reduces the risk of urinary tract tumors. Some studies have shown that exercise can reduce the likelihood of kidney cell carcinoma. It is thought that 13% of the causes of colorectal cancer are related to insufficient exercise, 12% to poor dietary habits, and 10%-15% to genetics. Obesity, especially abdominal obesity, is an independent risk factor for colorectal cancer, and too little physical activity is also a risk factor for colorectal cancer. Daily 30-60 minutes of moderate-intensity exercise can reduce the risk of colon cancer by 30-40%. Good lifestyle practices, such as good diet, regular exercise and maintaining proper weight, can reduce the risk of colorectal cancer by 50-70%. Cancer is a preventable disease, and new estimates released by the World Cancer Research Fund in 2012 show that 620,000 cases of cancer can be prevented in China each year through healthy eating, regular physical activity, and maintaining a healthy weight. Through these healthy lifestyle changes, a significant number of common tumors such as breast cancer (about 20% of cases), stomach cancer (about 33% of cases), and endometrial cancer (about 34% of cases) are difficult to prevent in China. To prevent “lifestyle cancer”, it is necessary to cut off the pathway between poor lifestyle and cancer. The only way to do this is for each person to start by himself/herself, abandoning unhealthy lifestyles, controlling behavioral risk factors, and becoming a practitioner and beneficiary of a healthy lifestyle.