By Dr. Brian McDonough, Medical Editor

PHILADELPHIA (CBS) - Exercise is very important for adults — we know that, but it is also crucial for children.

There are the obvious health advantages but, according to the American Academy of Pediatrics, it can have a direct effect on success in school academically.

Kids who exercise regularly tend to be a bit more relaxed and can concentrate well. There is a related and disturbing report that poorer children do not have as many opportunities to exercise and this may be having an effect on academic performance and sense of well being.

One of the suggestions is returning to more opportunities for gym class and exercise.