keywords: obesity exercise overweight schools girls
text: More Physical Education Time May Fight Obesity in Girls By RICK CALLAHAN    (AP) -- Just an extra hour of exercise a week could significantly cut obesity among young overweight girls, according to a study that researchers say could lead to major changes in the way schools fight obesity.    The study - the largest look yet at obesity among young children - did not show the same results for boys, possibly because they generally get more exercise than girls...