I study a couple of different martial arts (BJJ and Krav Maga). I study anatomy on my own by reading Grey's Anatomy (the medical book not tv show). I have a BOB puncing bag that I used a pink marker to draw lines to show where major arteries should be located. I work on my cardio, strength, and flexibility. I carry several items of differing levels of force so I can use appropriate methods if necessary. Also, I am 6'1" 250 lbs and so far...nobody has ever looked at me and thought...that looks easy! I walk with purpose and confidence, am constantly alert, scanning my surroundings, and do my very best to be in condition yellow as much as possible. So...I guess the short answer is I'd like to say yes but you never really know for sure until it really happens. I pray that it never does.