Young people like to be cool. What's cool? Different people have different answers. Some people think they are cool if they can wear fashion clothes. Some people think if they have strange hairstyles (发型), they are cool. Some people think they are cool when they wear fewer clothes in winter. But I don't think so. I think you are really cool only when you are healthy. How to be healthy? Exercise every day, such as running, walking and swimming. Exercise can make people healthy. Some students often catch a cold. Why? Because they don't exercise. They are not healthy. People can exercise with their parents or friends. Exercise can be fun. And it can help people keep healthy. So why not exercise every day?
