We all need to exercise. Doctors say it is good for us. It makes our body strong. And we will feel better about ourselves. We can exercise twice a week. Twenty minutes each time is enough（足够的）. There are many ways （方法） to exercise. We can walk, run, play sports or swim. Many people go to special（特别的）places to exercise. These places have a lot of equipment（设备）. They exercise with their friends together. Some people have equipment in their homes. Exercising can be fun. How do you exercise?
1．We need exercise. And doctors say it is| How many minutes...do you...? | |
| play pingpong | thirty minutes a day |
| walk | twenty minutes a day |
| play basketball | forty minutes a day |
| ride a bike | an hour a week |
| run | fifty minutes a week |
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