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Many children cannot run as fast as their parents could when they were young, a study of global fitness says.
Experts say the work - being presented at the American Heart Association's annual meeting - suggests children's fitness levels may be declining.
Researchers analysed data spanning 46 years and involving more than 25 million children in 28 countries.
On average, children today run a mile 90 seconds slower than did their counterparts 30 years ago, they said.
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To stay healthy, children and young people need to do at least an hour of physical activity - such as walking or cycling to school and running in the playground - every day. It can be done in small chunks rather than one session.