Everyone needs to go for a walk — if only to clear their minds and get their circulation going. Reese Witherspoon walked 1,610 kilometers on the Pacific Crest Trail in "Wild" because her character (real-life author Cheryl Strayed) needed to clean her head of the mess that had become her life. In "A Walk in the Woods," Robert Redford and Nick Nolte take on the 3,380-km-plus Appalachian Trail for more casual reasons, namely to embark on one last adventure before, you know, they kick the bucket.