I am a blackbelt in TKD and have competed alot, it was 8 years since i quit. Now in do Muay thai and my kicks are probably best in my club and im sure that it have to do whit my background as a tkd fighter. I have ofcourse converted my tkd kicks to muay thai kicks but is still have the speed and flexebility from the tkd.
If it is a tkd club i suggest that you get there and try it out. Tkd isent hard core it is more like fencing but it is fun and a good martial art to learn kicks.