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exercise
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Images & Videos
A man in athletic clothing jogs along a paved path beside a black metal fence, with trees and another person in the background.
proteins
How inactivity affects the human body
A group of senior citizens sits in chairs, smiling and holding their hands together in a prayer pose during an exercise class.
How physical activity can slow Alzheimer disease
At a Glance
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exercise summary
Quizzes
Assorted sports balls including a basketball, football, soccer ball, tennis ball, baseball and others.
American Sports Nicknames
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exercise: Media

physical fitness
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Videos

proteins
How proteins build muscle.
Video: © American Chemical Society (A Britannica Publishing Partner)
How inactivity affects the human body
Learn how the lack of exercise affects the human body.
Video: Contunico © ZDF Studios GmbH, Mainz
How physical activity can slow Alzheimer disease
Overview of Alzheimer disease.
Video: Contunico © ZDF Studios GmbH, Mainz

Images

jogging
Jogging.
© Tyler Olson/Shutterstock.com
human aging
Senior citizens participating in an exercise class for the elderly. Exercise can...
© Monkey Business Images/Shutterstock.com
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