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America's kids are more inactive than ever--Walking can make a healthy difference from the Federal Highway Administration, U.S. Department of Transportation. A quote:

According to Fenton, it is not just American children and adolescents who are inactive. Fenton says that adults in the United States are more sedentary than ever as well.

"Americans are less active than they ever have been," he said. "Twenty-five percent of our population is essentially sedentary 55 percent are only sporadically active and only about 10 percent of the population exercises regularly."

This lack of exercise is killing us, say researchers at the CDC and the American College of Sports Medicine. According to a joint statement they issued this year, approximately 250,000 deaths a year in the United States can be attributed to physical inactivity.