I’m writing to persuade you to take part in morning jogging after arriving at school every day.

After I attended your summer camp about health and lifestyle choices, I realized I hardly ever felt well, either physically     1     mentally. I often felt     2    (sleep) and dizzy, and lacked passion. Most worrying, though, I got the flu easily and experienced many toothaches. At     3     end of the camp, I heard, “Change the world by changing     4    (you).” This stimulated my motivation. A dentist once examined me and told me that too much sugar in my meals     5    (damage) my teeth and health. I made up my mind     6    (change) two things in my life: to eat nothing with sugar and to exercise     7    (regular). After that, I stopped     8    (buy) all the sweets, biscuits, and sugary drinks     9     I used to have every day. Whenever I went out without friends, I brought snacks from home, things that didn’t have any     10    (add) sugar.

My Opinion on Innovative Exercises

9 . Doctors have long known that diet and exercise are the best ways to stay healthy. But few people get enough exercise. Only 20% of Americans get the recommended 150 minutes of physical activity per week. More than 80 million Americans over age 6 are entirely inactive. People leading a sedentary (久坐的) life pay a price. They are at higher risk for serious health problems. These include heart disease and cancer.

Health experts want people to know about the benefits of exercise. They believe it can lead to slower aging, better moods, stronger vision—the list goes on.

This year, the U. S. National Institutes of Health (NIH) is starting a major study. It will record in detail what happens inside a body in motion (运动). Through its research，the NIH hopes to prove scientifically that exercise is good medicine.

The project will run for six years. A group of about 3, 000 sedentary people will take part in the project. They will range from 11-year-olds to the elderly. The group will begin an exercise program. Their blood, fat, and muscle will be studied before and after each workout. Scientists will look for clues to how the body changes with physical activity. A group that doesn't exercise will also be tracked. Experts will compare the two groups. Studies show that many positive changes happen in the body during and after a workout.

One of the best pieces of news is that much of what we already do counts as physical activity. “Sweeping the floor, watering the plants, washing the car—all that is exercise,” says Jack Berryman. He is a retired professor of medical history at Washington University School of Medicine, in Seattle. “Physical activity includes all movement, not just throwing a ball through a basket.”

Bamman hopes the NIH study will help doctors give each of their patients a detailed workout plan. In the meantime, here is a prescription (处方) for good health: Get active!