How Much Exercise Do You Really Need?
July 02, 2012
First lady Michelle Obama hands a ball to Olympic skater Michelle Kwan during an event in 2011 to promote physical fitness among military families
BOB DOUGHTY: This is the VOA Special English program SCIENCE IN THE NEWS. I’m Bob Doughty.
SHIRLEY GRIFFITH: And I’m Shirley 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 nine, heart disease killed almost six hundred 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.
SHIRLEY GRIFFITH: 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. Either way, the two things work together when it comes to improving one’s emotional health.
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