First of all, we should exercise, such as playing ball, walking slowly, running, cycling, swimming and so on.
Secondly, we should pay attention to diet, try not to eat junk food, and don't overeat.
Third, we should control our emotions. Bad emotions can cause endocrine disorders and affect the whole body, so we should maintain a good attitude.
Then, don't smoke or drink. You can drink less if you drink, but you'd better not smoke.
Finally, we should have good living habits, such as playing Tai Ji Chuan and drinking tea, but everything should be moderate and not excessive.