I thought this was well known already? People in Japan follow this even in work sessions. I remember some teachers had us take stretch breaks to walk around before classes.
Wish my kids could walk...the trouble with suburban US is the inaccesibilty in most areas for safe pedestrian travel.
How about the kids that have to leave an hour and a half early to ride the school bus?
how about kids who are driven .05 miles to a bus stop?