Children around the world are less aerobically fit than their parents were as kids, a decline that researchers say could be setting them up for serious health problems once they're grown up, according to NPR.
Children today take 90 seconds longer to run a mile than kids did 30 years ago, according to data from 28 countries. Children's aerobic fitness has declined by 5 percent since 1975.
Researchers at the University of South Australia used running speed as a simple proxy for aerobic fitness, because it measures cardiovascular health and endurance. Aerobically fit adults are much less likely to have heart attacks and strokes, and children who are aerobically fit are more likely to be fit as adults, NPR reports.
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