When I finished hiking the Appalachian Trail in 2009 I wrote about my adventure for my family and friends. A number of them told me they felt like they were hiking the Appalachian Trail with me from the comfort of home. I hiked the Pacific Crest Trail in 2012. They wanted me to write about that adventure, too. When I finished writing the book, I asked my vicarious hikers: "Are You Ready To Hike The Pacific Crest Trail?" That became the title of my...