I originally started because I was talked into it... I was dating this guy, and we were looking for something we could do together that was exercise and not too expensive (we signed up at a YMCA), and he had earned his 4th gup blue belt in TaeKwon-Do in high school. He spent weeks talking me into it... I walked into this room, half curious and half scared silly, and saw all these people (mostly guys) dressed in white pajamas... Now, I was never athletic as a kid, never interested in sports - my father bowled and golfed, and my older sister was on the diving team, and that was about it for my family. I'm not sure what it was, but by the third class, I was hooked! I dumped the sweatpants I started in and bought a dobak (a considerable expense at the time - I was paying my own way through college), and never looked back!
I've never been sure quite what it was that hooked me, but as I moved up through the ranks the attraction changed over time. Having never been athletic, or even particularly coordinated, mastering my first tul (pattern) was quite a revelation. Passing my first test was even more of one. At a demonstration held to attract new students, I broke my first board... everything I did made me want to try the next thing. TKD led me to instructing, which led me to teaching, which has become my career. The boyfriend is, thankfully, long gone (after the divorce he moved out of state) but the art has stayed in my life.
At this point, it has become a part of my life, my lifestyle, and has affected me in ways I probably can't even see any more - I consider joining that class to be one of the best choices I have ever made, because through participation in TKD I have evolved into a much different, and, in my humble opinion, better person than I would have been otherwise, and I can't imagine NOT being involved in some fashion at any time in the future.