Running fans only. This is a great read for runners, especially if you want some the story behind barefoot running, but it doesn't delve deep enough for general readers. The ultra distance runners we meet are a curious bunch and worthy of a much deeper treatment than the romantcised one we are presented with. The darker side of their choice to live on the extreme edge is not even touched on, which is very disappointing. I still enjoyed it and will savour my runs in my Vibram Five Fingers just that little bit more now.