A couple of years ago my son started begging to take karate lessons. After a little research, I discovered that an acquaintance of mine taught jujitsu, so I decided to take lessons with my son. I remember laughing to myself when I first saw the instructor teaching such nonsense as walking, falling, and making fists. Shortly thereafter, I was threatened with physical violence on a warranty claim, so I decided to take my classes much more seriously. When I first began taking jujitsu, I had to learn how to move in fights. I was shown how an experienced competitor would trip my foot as I placed my weight upon it. To counteract this, I was taught to move by sliding my feet on the mat in a C-like fashion. Since it is extremely important to stay balanced in a fight, I was warned that a competitor might try to get me off balance by pushing me back over my heels or pulling me forward over my toes. To avoid this, I was to approach my competitor at a 45-degree angle, ...