阅读理解。 What if your weight keeps going up? Here are some ideas to help you stay healthy: Don't sit around. Because it makes your fat(脂肪) stay easily. Stay active. Try to exercise 30 t0 60 minutes every day. Your exercise doesn't have to be hard, Start small. Take the stairs instead of the elevator. Walk or bike to places such as school or a friend's house. Help your mum with housework, such as cleaning windows or the bathroom-it all burns(燃烧)fat. Make changes from time to time so you don't get bored: Try running, biking, skating-there are many choices. Don't spend long hours watching TV or playing video games. Even reading a book burns more fat. 阅读短文，根据短文内容回答下列问题。 1. According to the passage, what's the easy way of making your fat stay? 2. How long does the passage suggest (建议)people exercise every day? 3. What can people do to keep fit at home? 4. What can people try doing if they don't want to get bored? 5. Why can't you spend long hours watching TV or playing video games?