Basketball is the favorite way for boys to stay active outside gym class; for girls, running leads the pack. (BIGSTOCK)

Young teens aren’t exactly embracing the government’s Let’s Move mantra, the latest fitness data suggest.

Only one in four U.S. kids ages 12 to 15 meet the recommendation — 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 lead author Tala Fakhouri of the Centers for Disease Control and Prevention said, “There’s always room for improvement.”

The CDC last week released partial results from the fitness survey, which involved kids ages 3 to 15. Other information will include fitness data based on more objective measures, including treadmill tests.

Fakhouri said the nationally representative results provide useful information for initiatives that aim to increase kids’ fitness, including the Let’s Move anti-obesity campaign launched by first lady Michelle Obama in 2010.

Kids were also asked which physical activities they did most frequently outside school gym class: for boys it was basketball, for girls it was running.

While few met guidelines for activity that raises the heart rate and makes you breathe harder, most said they had done at least an hour of exercise at that level during the previous week. Overall, about 25 percent said they got an hour of that kind of exercise every day.

Obese kids were less active than normal-weight girls and boys. Overweight girls were slightly less active than normal-weight girls; activity levels in overweight and normal-weight boys were similar to each other.

“It’s definitely very concerning to see that our kids are engaging in such a limited amount of physical activity each day when we are still battling” an obesity epidemic, said Stephen Pont, an Austin pediatrician and chairman of the American Academy of Pediatrics’s section on obesity.

Data suggest that obesity may have decreased slightly among some kids, but the overall rate for children ages 2 to 19 is 17 percent, which equals about 12.5 million obese kids.

Pont said schools can do more to help by not cutting recess and giving kids more time for physical activity. He said research suggests that kids who get physical education at school may do better academically.

Recent national data on kids’ fitness levels are limited. A 2009-2010 CDC survey involving kids ages 6 to 11 found about 70 percent met the physical activity guidelines, although levels dropped off among older kids in that age group. The results came from parents, who may be inclined to over-report how active their kids are because of “social desirability,” the researchers said.

— Associated Press