selecting the magnet, i used the "z trans" dial and pulled the boobs out.
you'll notice that the abdomen is still caved in, you can set the magnet to affect the abdomen by "add element to deform" in the magnet properties tab.
notice that since we moved the circle up towards the nipples, her back is still in the right place.
Magnet Tutorial
unfinished, just posting a couple pics for roz's reference.