Great fundamental look at mental toughness training within the CrossFit context. I will NEVER nor do I really want to be SEALworthy (I dread being cold and wet when I get out the shower, let alone for hours at a time mixed in with sleep deprivation) but this is a very thought provoking look at the connection between mental control and physical prowess. About 70 percent of the book is day by day WOD/workout descriptions but the 30 percent of other material was really great and has put me on a new reading path.