I did a very intense year of Muay Thai (private lessons in addition to two group lessons/day, most days of the week). My interest was in the discipline and training, as I have no desire to hurt anyone. Good thing too, because I'm completely worthless in a fight. I have the reaction time of a foot-stool. It doesn't help that I wear contact lenses, and the slightest brush across my lashes will cause my contacts to immediately drop to the ground.