We often think exercise can make us healthy. 【小题1】 You may try some of them.

What we eat is important. 【小题2】 It’s better to choose healthy food such as fruit and vegetables.

【小题3】 About 60% of our body is made up of water, so drinking enough water is necessary. Doctors say we should drink at least eight glasses of water every day.

Another helpful way to stay healthy is to be more active (活跃的) during the day. 【小题4】 You could also walk or ride your bike to school every day.

【小题5】 How long each person needs to sleep may be different, but most people should sleep seven or eight hours a night.

Teenagers believe anything is possible if they study hard. But they often forget to think about healthy diets, enough sleep time and exercise. In fact, these things are really important for them to keep fit.

It is important for teenagers to get enough energy. Teenage girls need about 2,200 calories a day while boys need a little more—doctors suggest 2,800 for teenage boys. 50% of their calories should come from healthy food-rice, vegetables and fruit. People often say an apple a day keeps the doctor away. Teenagers also need to drink a lot of water, 6 to 8 glasses a day. Drinking enough water will improve their skin.

Teenagers usually need eight to ten hours' sleep at night, but many Chinese teenagers do not get enough sleep. A report shows that without a good night's sleep, teenagers seem to be weaker than they should be. Too much homework is not the only reason why teenagers stay up late. Some watch TV or play computer games late into the night. Teenagers should develop good study habits. So some clever students never study late, but they are able to work well in class.

Exercise is something that can help them. Experts suggest that teenagers should spend at least 30 minutes exercising a day, five times a week. They will feel relaxed when they exercise. It can even help them sleep better at night

Thanks to better health care, most people are living healthier and longer lives. Here are four rules for a healthy life.

Get off the sofa!

Sure, it is comfortable to sit on it, but doctors say you should get off it. 【小题1】 Think about it: do you get enough exercise today?

【小题2】

It is important to eat food that is fresh and natural, for example, fruit and vegetables. Fast food is not healthy. You should only have it once in a while. 【小题3】

Rest while you can!

【小题4】 Teenagers don’t need as much sleep as babies, but it is important for them to get about eight hours’ sleep a night. At weekends, you have got more time, so use it not just for your friends, but for rest, too.

Do not worry. Be happy!

Many people believe that it is important for our general health to be happy. Sometimes it is not easy to be a teenager because of the difficulties of school exams or friendships. 【小题5】