San Soo is straight up combat, not sport (even in roughest forms as MMA, etc.), and not even self-defense. Kempo (I'm using the 'm' on purpose so it can be taken as either American Kenpo, Hawaiian Kempo, or Shaolin Kempo), is more self-defense. Drawback to San Soo for the street is you don't always want to maim or kill an opponent, but advantage is you'll probably live though the attack. A lesser drawback of San Soo as I learned it is the number of preset techniques (combinations) is few-to-none, so you're relying on 'lower' brain (or instinct) to come up with the right thing at the right time. so what makes san soo so tough? Isn't "straight up combat" and self defense the same thing?