Don't Sit Down While You Read This

* Get moving, kids!

That's the recommendation of a new study looking at kids who are overweight and at ways to combat the problem. About 15 percent of kids ages 5 to 17 are overweight.

Just an extra hour of exercise a week could really help cut down on obesity among girls, according to the report, which used data from the Education Department.

That extra hour of movement could come during physical education classes at school. But many school districts have cut back on PE classes to make sure kids spend more time in class preparing for standardized tests.

"Many of those schools that made those choices to cut back on PE classes now realize that was not a good decision in regards to their students' health," said Vincent Ferrandino of the National Association of Elementary School Principals. (KidsPost columnist Fred Bowen wrote about this topic on Friday. You can read his column at www.washingtonpost.com/kidspost.)

The study found the effects of the extra hour of exercise helped girls more than boys, but experts agree that more exercise and better eating can help everyone.

Extra exercise each day can help girls avoid obesity, a new study says.