AP
While that finding is not surprising — given previous research showing that about 16 percent of U.S. schoolchildren are seriously overweight — it's "very concerning," said Dr. David Ludwig, director of the obesity program at Children's Hospital Boston.
Ludwig, who was not involved in the study, called treadmill tests a good measure of fitness. He said the results show that "at a time in life when adolescents and young adults should be at peak levels of fitness, there's in fact a very high prevalence ... of very low fitness."
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