In my case I started out with futbol (soccer), then merged into tennis (which I still play when I have the time and worthy adversary), but I settled in swimming, sport which I deeply love and have been practicing for the better part of the last 12 years. And up until a couple of months ago, I decided I needed a new challenge, and an Ironman came into mind. So, now I am not only swimming, but also cycling, and running. I still have a little over a year to prepare for the event, but man, it takes some getting used to the long training sessions. All sacrifices come with a good reward, so mine is waiting for me on the other side of the finish line.
Happy trails,
Alex