The competitive nature of all Sports builds character and demands that one develops skill and competence. However, contact sports require an above average character and courage. Karate, boxing and rugby require that you not only face your opponent, but that when your opponent strikes you, you must not react in anger. These sports require that you control yourself and develop the capacity to remain calm and focused under extreme provocation. If you want to develop self-control, you may need to engage in some form of contact sport.