Fedewa and Ahn 2011 completed a meta-analysis of 59 studies from 1947 through to 2009. Over 200 different metrics were used through the studies however the conclusion was clear. Physical activity, exercise, organized games, free play and all other forms of movement have small but measurable effects on children’s attention, cognition, stress, mental health, memory and most other factors tested. To beat a dead horse- get your kids off the Nintendo, outside and playing in a park a few times a week. Their averages will bump up half a grade point and they’ll get on the honour roll.