American government has changed their advice on people's physical activity.
In the past the government advised that children should start exercising at the age of three.
Young children need at least three hours of exercise a day.
According to doctors, people should start exercising at the young age.
The human brain develops the most up to the age of five.
According to the text, healthy habits are more likely to change as children grow up.
Parents should buy exercise equipment for their young children.
Children exercise when they play actively.
Exercise that makes the heart and lungs work more actively is called aerobic exercise.
Climbing trees can make children's muscles weaker.
It's a good idea for children to climb trees more than twice a week.
If you want to stay young, you should be active.
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