Psychiatrist: Walking Stimulates The Brain 'In Many, Many Ways'

According to psychiatry professor and author John Ratey, something as simple as a walk can improve both physical and mental well being. Ratey is co-author of the book "Go Wild: Free Your Mind from the Afflictions of Civilization." Last year, he and Here & Now's Jeremy Hobson went for a walk near the Charles River in Boston. Today we revisit that conversation.