There were some kids in my class when I was teaching in the 60's (pre ADD and ADHD) who, occasionally, I would send outside to run around the track/field for a few laps. They came back fine.
You would not be allowed to do that today, as every kid must be watched/accounted for by an adult at all times of the day.
I wonder how many potential geniuses (Edison and the like) are having their genius potential masked by Ritalin?
I think much of it has to do with proper "order" in the classroom.
Of course, there are some real cases, but I have seen too many boys who were "squiggly" in the classroom referred by female teachers who didn't really understand boys.
However, there is some current research on boy's learning style - they MUST be moving and exploring in new ways to learn effectively.
Man, am I in trouble now.