Matt McFarland of CNNMoney writes that Silicon Valley's top execs are obsessed with taking walks. There's now even a book on the subject.

So who's been walking the walk? 

1. The late Steve Jobs 
2. Pixar's first chief financial officer, Lawrence Levy
3. Amazon founder Jeff Bezos
4. Facebook CEO Mark Zuckerberg
5. LinkedIn CEO Jeff Weiner
6. Uber CEO Travis Kalanick

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