Hey, karate is more than just "yoga for boys"!

[He takes offense to that, Hiro. How dare you and your apparently strong muscly arms.]

But I mean... yeah. There's a lot of forms and kicking and punching but it's not like you have to be a big beefy swole guy to know karate. The point is that anyone can learn it, even annoying little brats like Jeremy Birnbaum.