Undoubtedly, for me, the worst sparring partner has to be the ego. Whether it is my own or that of somebody else, I hate having to fight pride in the do-jang. We've all been there. We've all mastered a technique, or achieved an amazing stretch, and won the accolade of all the other students. Then, a stranger walks into the class with a greater mastery of technique and an even better stretch. We then spend the rest of that lesson, and indeed many more, tackling our pride in acknowledging that there is somebody better than you at the thing you love most in life. And we've all been there, at least once, when the ego of another comes into play. For me, it was when a student from a different school of Taekwon-do training (I am ITF, he was WTF) joined our club. He was bigger, a lot bigger, than any member of the do-jang. His technique was crude, yet very effective. He used his size and power to destroy any confidence in whoever had the balls to step up to him. He would use amazing spinning kicks, with full power, as well as his very good boxing skills to put anybody on their *. He was even a challenge for our instructor. One of his opponent's suffered a broken rib, another a broken foot, and another a broken nose. And this was just in the first lesson. It was his ego, his enthusiasm to show off and be the "alpha male" that wouldn't allow him to control his techniques. He took the sparring totally out of context. It was supposed to be fun; he made it hell. It is the ability to subdue our egos and control our pride that makes us true martial artists