CHICAGO (AP) -- The government's latest fitness data suggest young teens aren't exactly embracing the Let's Move mantra.

Only 1 in 4 U.S. kids ages 12 to 15 meet the recommendations of an hour or more of moderate to vigorous activity every day.

The results are based on about 800 kids who self-reported their activity levels and had physical exams as part of the 2012 National Youth Fitness Survey.

Government researchers won't call the results disappointing, but the lead author says, "There's always room for improvement."

While few met the guidelines for activity that raises the heart rate and makes you breathe harder, most said they did at least an hour of exercise at that level during the previous week.

Data suggest obesity may have decreased slightly among some children, but the overall rate is 17 percent, or about 12.5 million obese kids.

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