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¡¾ÌâÄ¿¡¿More and more scientific experiments prove that physical exercise can reduce the dangers of some illnesses in middle-aged persons£®Exercise strengthens the heart muscle£¬reduces blood pressure and help to prevent muscles from changing into fat£®Physical exercise is just as important for children£®

Exercise and food affect growing speed in young lab animals£®Baby mice start running as soon as they are big enough to use an exercise wheel in their cage£®If they get extra food and run a lot£¬they will grow as much as 1.5 times bigger than normal£®

The same differences in growing speed might be found between active and inactive children£®Physical exercise helps active children grow faster than inactive children£®One experiment shows that the brains of the mice that had enough exercise weighed about 3£¥more than those of the mice that did not exercise The mice that exercised are much quicker to learn doing new exercise than the mice that did not exercise£®

The results of the experiments suppose the theory that exercise can help babies learn to talk and walk sooner than expected£®

The good effects of physical exercise are not limited to children and middle-aged people£®Exercise continues to be an important part of our lives after we grow old£®For example£¬people over 50 years old begin to lose calcium(¸Æ) from their bones£¬which get weaker and can break easily£®Physical exercise£¬however£¬helps to strengthen the bones and to prevent them from losing calcium£®Of course£¬old people can take medicines to prevent themselves from suffering from losing calcium£®But the medicines they take increase the chance of developing some kind of cancer(°©)£®So physical exercise is a much safer treatment(ÖÎÁÆ)£®

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Title

Physical exercise

Theme

Physical exercise does ¡¾1¡¿ to people¡¯s health ,both young and old.

¡¾2¡¿

of experiments

¡¤Baby mice will be as much as 1.5 times bigger than normal on ¡¾3¡¿ that they eat extra food and run a lot.

¡¤The brains of the mice that had enough exercise were ¡¾4¡¿ than those of the mice that didn¡¯t exercise.

¡¾5¡¿

Children

¡¤Helping active children grow faster than inactive children.

¡¤Being¡¾6¡¿ For babies to learn to talk and walk sooner.

The middle-aged

¡¤¡¾7¡¿ the heart muscle.

¡¤Reducing blood pressure .

¡¤Preventing muscles from changing into fat.

Old people

¡¤Helping the old people¡¯s bones get ¡¾8¡¿ by preventing them from losing calcium.

¡¤¡¾9¡¿ the chance of developing some kind of cancer ¡¾10¡¿ by medicine.

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