Zhong Nanshan is a great doctor, he helps lots of Chinese even people around the world. He is 84 years old but looks only 60. He knows the secret to . He does some simple things to stay healthy. First, he gets . He often goes to sleep before 11 p.m.and gets up before 7 a.m. Second, he keeps a . He eats lots of healthy food. He usually has oranges, bread and milk for breakfast. He eats a little meat and . Third, Doctor Zhong takes . He runs for 30 minutes every day and sometimes swims with his wife. Finally, Doctor Zhong is busy but he never . When he is free, he often dances. He says he is very happy when he is dancing. That's why, even at 84, he looks still very young.