Krav Maga, and before anyone groans let me explain. It's simple, it's not fantastical or requiring of peak physical condition, and it applies modern understandings of anatomy. It's about aggression and situational awareness, knowing when it's best to walk away and when it's best to attack first. Those are the scenarios in Krav, there really isn't a "duck first by design" aspect to it. It's also not about looking "Swayze-esque" in a bar fight. It's serious shit, with a good instructor you are talking about learning to inflict maximum damage, including permanent injury or death. It won't make you a badass, or a boxer, but it might give you the reflex muscle memory to save your life someday, which is why I'm guessing the IDF and Israeli SF teaches it. I took TKD as a kid and after I got back from the war I needed something... violent. Found an awesome Krav instructor in Virginia where I was living at the time. Took classes for about a year, I'd reccomend it. It might seem intimidating but... do you want your hand held by a people person or do you want to learn something useful from (likely) some Jar-Head with actual real world experience in applying these techniques on a human being?