Some facts from recent Out Door Symposium.

14.6% of low income children between the ages of 2-4 are obese.
Children who are cared for at home or by relatives are more likely to be obese.
400% increase in children ages 6-11 and 70% of those children will be obese as adults.
Children need at least 1 hour of vigorous activity a day.
Boys are more active then girls.
Active parents = active children
Natural materials and other landscape elements allows for more spatial-cognitive awareness and play.
View of nature like green plants equals less stress.
Nature helps reduce ADHD.

Now these are just facts that were brought up at a local outdoor symposium.