I'm surprised no one's mentioned one of the greatest advantages of walking and talking - spatial memory.<p>I used to go to a therapist who would hold walking sessions along a trail or path in a park. The best thing about it, besides forcing me to get out of bed and be in nature, was that I could remember exactly what we talked about and when, based on landmarks along the trail (e.g. "we were discussing X when we walked over this bridge). Similarly, I find that if I have a phone conversation while driving, I can remember it much better because parts of the conversation correlate to locations I passed as I was driving.