As a Greek philosopher that I can't remember said, it is a shame to not find out what your body can fully do (or something along these lines).
I'm not going to lie, I started because I wanted to get a bit stronger and look good for girls but it's changed now. I get satisfaction when I know I'm improving my body or lifting heavier weights. It's just to see what my body can really do - they are amazing things and it feels like a shame that many just sit around doing nothing to never find out their physical "limits".
But mainly just to get 6-pack and pick up dem womenz!