I believe that the health of a person depends on his lifestyle. In order not to hurt, you need to follow a few simple rules: exercise, eat right, relax and spend more time outdoors. I'm 15 years old, and from them the last 3 years I do exercises every morning. It gives me courage and strength for the whole day. In the winter I add a dousing of cold water. Consider hardening the main way of preserving health. My favorite winter sport is skiing and skating. In the summer I prefer to run in the Park and play tennis. All year round I go to the pool twice a week. Swimming strengthens the respiratory system. I also try to observe the regime. I go to bed and get up at the same time every day. I give special attention to nutrition. I don't eat fatty and high calorie food and drink heavily carbonated drinks. At my age, some peers already smoke and drink alcoholic beverages, but I think that this is destructive for the body and if not now, then in the future will necessarily affect health.