Hehe According to the latest research, Ninjutsu is an ancient martial art in Japan. It was produced 900 years ago. It is said that Ninjutsu is famous all over Japan and has a high reputation. Among them, Ninjutsu can kill with one move. If a person punches the soft part of the ribs under the chest, the heart and lungs will immediately compress 5-7 centimeters inward, causing the heart to stop and the arteries to rupture, and death will occur in less than 2 minutes. It works even for big guys like sumo.