You probably know that walking does your body good, but it's not just your heart and muscles that benefit.

Researchers in New Mexico Highlands University found that the foot's impact during walking sends pressure waves through the arteries which can increase the supply of blood to the brain.

Blood flow, of course, delivers vital nutrients to the brain and remove toxins from the brain. 
StructuralChiro: http://goo.gl/lNju1s