I wonder how much of a correlation there is between people who put effort into self-training in rationality (or communal training, a la Less Wrong) and those who actually train a martial art. And I don't mean in the "Now I'lll be able to beat up people Hoo-AH" three-week-course training - I mean real, long-term, long-rewards-curve training. I've done aikido on and off for years (my life's been too hectic to settle down to a single dojo, sadly), and it takes a similar sort of dedication, determination, and self-reflection as a serious foray into training your mind to rationality. And, I'd go so far as to say, a similar 'predilection of mind and preference' (and I'll let you LWers go to town on that one).