This girl questions all the time.

We should use our car less to air pollution.

    Do you worry about your health? Have you tried to run or walk for exercise and then quit? If you answer yes, you should try a new type of exercise: aquatic exercise.

Aquatic exercise is a kind of exercise you do in a swimming pool. For example, you can run, walk, or even do a mind body practice, such as yoga.

    More and more people are trying aquatic exercise. In the United States, the number has grown by 25% in recent years. People in other countries are also doing aquatic exercise more frequently.

    Aquatic exercise has many benefits. First of all, it feels easier than exercising on land. I Why? You weigh about 90% less in the pool. It is also better for your knees than running or walking.

    Aquatic exercise feels easy, but you still burn calories (卡路里). Water is 1,000 times thicker and heavier than air. In the same amount of time, you can burn more calories in the pool than in the gym. That's because it takes more energy to move in the water.

    But what if you are scared of water? No problem! There is nothing to worry about. Aquatic exercise is safe and easy to learn. It doesn't require any special skills. For most kinds of aquatic exercise, you don't even need to know how to swim.

    In fact, most people say they feel more relaxed in the water. They stop thinking about the things that make them anxious. The cool and t quiet environment makes them exercise more.

    Aquatic exercise is suitable for everyone. You can do it at any age. It can even help people who have been hurt in accidents. With aquatic exercise, they can move in ways they can't on land. For example, some people who can't walk can walk and even run in the water.

    So are you looking for a fun new way to improve your health? Why not try? Join the millions of people who are burning calories while keeping cool in the pool.

A: Hey, Frank!   ?

B: Pretty good.

A: Did you have fun last weekend?

B: . I went to the old people's house with my friends and had a good time.

A: Wow! What did you do there?

B: We helped the old clean their houses and chatted with them. How about you?

A: I just read a science magazine.

B: Oh, really? ?

A: Hum...it is about the main cause of smog(雾霾) and ways to beat it.

B: Great! But ?

A: We can live a greener life by using cleaner energy to solve the problem, I think.

B: You do?

A: Yes, natural gas is a good choice. By the way, ?

B: It's 7:45 now.

A: Oh, God. Hurry up, or we'll be late.

B: OK.