I feel I should also mention that we already have a fist-user here, Catherine, who's extent in martial arts is "I punch thing in face hard and thing die." Kinda feels a bit... redundant, I'd say, to throw in a martial artist as well. Also, if your character is younger than the time the world went to shit, who'd teach them the martial art anyway? I could see some old dude keeping the judo lessons he had from 20 years ago, but no one would learn any specific forms of martial arts. I could see someone teaching general self-defense classes at best, however. :V