Winning an Olympic gold medal is not easy. I never won one; neither did my brother, Kees.

Writing a book is also not easy. But we did it! I am so proud of our accomplishment. It feels like our gold medal. You never win gold alone. I want to thank many people.

My wife, Monique, who listened for two years to all the ideas I had. My son Max (20 years old) who was part of the research team, my son Sem (14 years old) who asked lots of questions while he practiced his English via this book, and my daughter Fleur (12) who assisted me with food and drinks while I was writing.

Besides all the other people who read the book, gave feedback, and asked lots of questions to help me improve this book, I want to thank my late coach, Koos Henneveld, who asked me the “two questions.” My parents, Wout Wurth and Nennie van der Matten, who always showed their pride during our journey of writing this book.

Finally, I want to thank my soul mate, brother, business partner, and co-author Kees for all his input and support and for being a sparring partner not only on the Judo mat but also on paper. This time we did it!