Take up competitive level speed skating or cycling, those people have massive curves.
But seriously, unless you're going to train at an elite level, trying to spot build/reduce is a bit of a waste of time.
I used to be a professional ballet dancer and later a personal trainer, so I have some idea of what I'm talking about.
I've been on HRT a couple of times within the last 5-years and I can tell you that my shape changed quite a butt, er... bit.