As early as 1600 BC, children used vines for play. Jumping rope has evolved in style and intensity throughout the years, but it still remains one of the most popular exercises. It burns up to twenty calories per minute. Although children have been playing for thousands of years, play was not their primary source of exercise. In fact, their daily chores, such as plowing fields, washing clothes, caring for farm animals, and preparing meals burned more calories than any exercise could have. Toda
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