Hi, I prefer a type that is strictly self-defense. I have taken classes in TaiChi before, but I would like to practice something that is a little more "physically energetic" so to speak. However, I have heard that TaiChi is the Grandmaster of Martial Arts. Is this true? I am looking for something that has a "philosophy" as well as a physical discipline. What type of Martial arts should I start taking classes in?