Around the globe, children are about 15 percent less fit than their parents were when they were young. In the United States, kids' cardiovascular endurance performance declined about 6 percent per decade between 1970 and 2000.
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Source: http://feeds.sciencedaily.com/~r/sciencedaily/health_medicine/fitness/~3/XQdjm-xOfRk/131119112809.htm
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