Self-defense techniques taught in martial arts gyms are so complex and difficult that strange people cannot use them as freely as they would like in a real fighting situation. So, I introduced easy and powerful self-defense techniques in this book. Because of the danger that they might cause serious injuries or even death if used wrongly, these techniques aren’t taught at martial arts gyms. And Modern martial arts prohibit using these techniques as they call them foul plays. In dealing with violent crime, sports martial arts have its limits. In my point of view, we wish to use all of the defense techniques including what modern sports martial arts call ‘foul play’ in order to offer protection to our self-respect and our circle of relatives from violence. I’m sure this book will be very helpful if you end up in danger.