My first and only sport is Parkour. I've been practising it for about 5 years now and I wouldn't do anything else but this. Also I mix it up with some freerunning and tricking. Search some videos on YouTube if you don't know what it is.
I'm really sure there were other actions earlier like swim and such things I don't really want remember , but ... Played some hockey with my big brother in the front of our house when I was 4 or 5 years old is the earliest I remember. Became a track and field athlete when i was 7 or 8. That was the first I did as a 'sport'.