Hey there, have you ever heard of Krav Maga?
Nope. What is it, or who is it?
Krav Maga is a military self-defence and fighting system developed for the Israel Defense Forces.
Wow!  Can you describe the principles?
Krav Maga focuses entirely on real-world situations through extreme efficiency.
Efficiency of use of body?
Yes, it was created through the combination of boxing and wrestling. Efficiency is key!
Does it also involve taking a life if necessary?
It certainly can. Krav Maga revolves around extreme aggression, so it can happen if the user isn't careful.