Sometimes all you need in life is a nice, long walk to clear your head and put things into perspective. The longer you walk, the more time you’ll have to look into yourself and find some answers. I’d say walking 4,500 km is plenty long enough, but don’t take it from me. Take it from this guy.
Go look at his blog for more information on him and his walking addiction. Oh, and try and get out there, take a walk, and clear your mind.