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Friday, November 22, 2013 - 8:55pm
(CNN) — Kids are less fit than their parents were at their age. That's not only in the United States, but around the world.
A Ph.D. from the University of South Australia's School of Health Sciences presented the findings to the American Heart Association.
He and his team studied more than 25 million kids in 28 countries between 1964 and 2010.
They timed the children as they ran up to two miles and found they are about 15-percent less fit, at least from a cardiovascular standpoint, than their parents were when they were children.
Researchers said the decline in cardiovascular health could mean worse overall health in adulthood.
To try to reverse the trend, they recommend children get at least an hour of "big muscle" exercise each day, like running or bike riding.