As a long-term martial artist, and practitioner of Jiu Jitsu. I enjoyed the references in the audiobook in terms of applications for Jiu Jitsu and how those same principles apply in Life. They were brief in description but made the points that were intended. However, I'll say this if you are a Jiu Jitsu practitioner and wanting to get the full effect of this book both on and off the mat. You can only fully appreciate the Audiobook IF you also have hardback copy as well. Hardback copy of this book not only allows you to read it, which I feel hammers the points home or in depth, but you can also view the videos related to the technical applications of the principles. Concept and principle-based learning have been proven to be the best ways to both learn and master a skill set. However not everybody is the same kind of learner. Some people are kinesthetic. Some people are visual. Some people are auditive. To get the most out of it it's best to have the book as well as the audiobook because you get the added benefit of the videos and you get to dissect it more by reading it and listening to it. That's just my opinion based on my experience. I hope whoever purchases the book or the audiobook get something out of it like I did. I will be applying these concepts on the mat for sure and the same in my own life and interpersonal relationships. I do feel like the videos could have been more detailed and the book could have been more in depth but I understand they had to put limits on the length of the details and the videos because not everybody has a long attention span.