Any other INTPs practice, love, and/or are interested in martial arts. I have studied martial arts in the past and planning to start learning kendo sometime in the future. I have taken kung fu, aikido, tang soo do kick boxing, and amateur wrestling if that counts.
It's one of the many things I've thought about doing, in a "maybe I should try that one day..." kind of way. However, almost every guy I've been attracted to or dated has been into martial arts. I think it's a very INTP kind of thing.