Started very well, for a while I thought it described perfectly the state of mind I am in on walking trips but later the book descends into slightly ridiculous half formed thoughts and a toe-curlingly disgusting description of a walk through New York city's sewer systems.
Kagge lost me on page 109 with "most of the people I know who struggle with big personal problems are those who don't take walks", offering no further explanation of what these problems might be.