I'm noticing this too. I was actually discussing it with my friend that I exercise with. We've always been non-exercisers, and joked about now that we love exercise more and more, if our old personalities would completely disappear and that we would become exercise people that we always have made jokes about.
So when we talk to other people we know, our answer will now be "yeah, no sorry. We're all about exercise now". Sounded funnier in spoken form, but still :)
Haha yep it has begun. I was the same and really didn't see the point in training and could never see myself as a body builder. Nek Minit.
Now I would rather spend my saturday night in the gym rather than catching up with friends.