Ⅱ. Teenagers’ future plans.
According to a study by WHO, only 5% of the people in the world are really healthy, 20% of people are sick, and 75% are sub-healthy (亚健康的). Most unhealthy people don’t get enough exercise. It is a very important reason. How should we exercise? 1
Make a plan
2 Having a plan helps us know what to do each day, and it can let us have a clear goal. It’s best for us to exercise twice a week. Each exercise time doesn’t need to be too long. 3 And also, make sure our plan is practical (适用的). If we never run for a long time, don’t run for thirty minutes a day during our first week of exercise. We should increase (增加) the time of it little by little.
4
Walking is a good way for beginners. We can take a walk every day. It can improve our sleep. 5 It is an easy way for people to exercise, and we don’t need to choose any special time and places to walk.
In a word, exercise is a good way to keep fit. Besides, we can also do it according to our own hobbies, such as playing some ball games.

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1. F 2. D 3. B 4. C 5. A