How Much Exercise Do You Really Need?
27 June 2011
Mothers and their babies in a park in Strongsville, Ohio, in a fitness class called "Baby Boot Camp." The classes are offered nationwide to help pregnant women and new mothers get fit.
BOB DOUGHTY: This is the VOA Special English program SCIENCE IN THE NEWS. I’m Bob Doughty.
SHIRLEY GRIFFITH: And I’m Shuirley Griffith. Today, we will tell why exercise is so important. And we will tell about some popular ways to get in good shape.
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BOB DOUGHTY: Health experts have long noted the importance of physical activity. Exercise not only improves your appearance. It can also improve your health. Exercise helps to reduce the risk of some diseases. They include heart disease, stroke, type-two diabetes, osteoporosis and even some kinds of cancer.
America’s Centers for Disease Control and Prevention says heart disease is the leading cause of death in the United States. In two thousand six, heart disease killed more than six hundred thirty thousand Americans. High blood pressure and high cholesterol levels in blood can increase your risk of heart disease. Medical experts say both can be reduced through normal exercise.
VOICE TWO: Physical activity is also known to increase the release of endorphins. These chemicals reduce feelings of pain. They also help people feel more happy and peaceful.
There is some debate about exactly what causes the brain to release endorphins. Some experts believe it is the act of exercising itself. Others say it is the feeling one gets from having met an exercise goal.
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