History , Historically, people walked as a form of transportation. By 1900,walking was an Olympic event., Surprising statistic or fact, A vigorous exercise 30-minute walk raises your heart rate and burns over 100 calories, Positive or negative opinions, Many people view walking as too easy to improve health or help weight loss., Definition, Vigorous exercise is physical activity that raises the heart rate and speeds up breathing., Trends or recent changes, By the 1990’s, walking was a popular US sport with over 65 million regular walkers..

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