...The author grew up in hell and went through hell to become one of the toughest men in the world, if not the toughest one. To remember just one fact that only he (in US history!) completed SEAL training (including two Hell Weeks), the U.S. Army Ranger School (where he graduated as Enlisted Honor Man) and Air Force Tactical Air Controller training... having a hole in his heart and not fully functioning lungs! And it is not about what he achieve but what he overcome to achieve it. AND during his journey, he found wisdom and peace in his mind. Most of us have a lot to learn from his book. As author says, most of people realise only 40% of their potential; he inspire us to get more out of our lives. David Goggins, I salute you! Thank you so much for your book! All the best in your life and new conquered heights. With great respect, Alex.