Once upon a time, children raced home from school, grabbed a snack and then headed outside to play — sometimes for hours. Fast-forward about 50 years. Only 15 percent of today’s kids get at least 60 minutes of moderate-to-vigorous physical activity every day. Instead of chasing each other around the playground or forming an impromptu neighborhood game of kickball, they’re in the basement playing video games. Nationally, it is recommended that kids get 30 minutes of exercise daily in school and 30 minutes out of school. A study found only 15 percent of the children involved got an hour of daily moderate or vigorous exercise. while at school, just 8 percent were able to get 30 minutes of exercise. The greatest disparity was between boys and girls, with girls being far less likely than boys to meet both of these guidelines. As compared to normal or underweight children, overweight and obese children were also less active overall and achieved fewer minutes of exercise during school, out-of-school and on weekends.