1. Exercise can make people absorb several times to dozens of times more oxygen than usual. Medical research in the United States found that the human body absorbs more oxygen and breathes faster, and through physical gas exchange, some carcinogenic substances can be expelled from the body, reducing the incidence of cancer, and even if one has cancer, the body recovers faster and can prolong life. 2.Exercise can greatly reduce the excess fat in the body, and sweating after exercise can make carcinogenic substances such as lead, strontium, nickel and beryllium in the body excreted with sweat, thus playing the role of cancer prevention. 3.Exercise can speed up blood circulation so much that cancer cells are like small sand in turbulence, not easy to stand on their heels and not easy to be transferred, and easy to be removed by immune system. Experimental evidence shows that when the body is in motion, the hourly secretion of interferon from the blood is more than doubled compared to the usual, and the anti-cancer ability of interferon has long been confirmed in observation. 4, exercise can make the human body certain reproductive hormones greatly reduced, or even stop production. Research by scientists at Harvard University found that reproductive hormones are also closely related to cancer, and people who start exercising at a young age can significantly reduce the incidence of cancer. 5. Exercise can improve people’s mood, eliminate sleep and worries, and psychologically reduce the stress of human immune system. Clinical data show that most patients who suffer from cancer are emotionally depressed or traumatized. For them, regular deep breathing exercises, walking or running, soft gymnastics, stretching, swimming, cycling or participating in group sports can bring them physical and mental pleasure and joy, help eliminate tension, reduce sleep and improve self-image. Foreign doctors compared exercise to “mild antidepressant”, calling it “Western-style qigong”. 6. Exercise can exercise the will and strengthen the confidence and perseverance to overcome cancer. Confidence and perseverance are crucial to overcome many diseases. A poet once said, “Confidence is half of life”. When a person is ill, especially after cancer, he or she should have a strong will, belief in victory, great perseverance, optimism, great courage, tenacious spirit of struggle and the courage to overwhelm the disease.