This is the Parkour book I've been waiting for. It deals with the most interesting, and least well-documented, period of Parkour's history and does a great job balancing the historical narrative with fun and inspiring anecdotes from the founders' training. It also tells a very different story from the one many people know, and covers the separation of David, Seb, and the Yamak like nothing else ever has. It's a seriously invaluable resource for anyone that is interested in the story behind Parkour.
I've never read a book that tempted me to get up in the middle of the night and go train the way this one did. The spirit, passion, and strength of character that the original practitioners had shines through in this book at a time when we as a community definitely need a reminder of it. No cameras, no bulls***, no fancy cross-training programs...just a bunch of friends pushing themselves as hard as they could every single day.
The book does a good job avoiding the pitfall of nostalgia, which is always hard to do in Parkour. It also felt like a VERY accessible read, even to non-practitioners or practitioners who may not align themselves with the values of the original group.
If you've been wavering over whether or not you should purchase this book, stop now. Anyone who feels passionately about Parkour, freerunning, or Art Du Déplacement should consider this an absolutely essential read. It's the first "real" (in that it isn't a guide or handbook but delves into the history, psychology, and culture of the movement and individuals who created it) Parkour book to me, so go check it out. It's an amazing contribution to the community and overall body of Parkour knowledge available.

-Max Henry