First off I'd like to say I'm a 38G and finding bras to wear every day is hard enough but to find a sports bra to go running in is miserable.  But this bra hikes up my breasts and keeps them up there.  It separates them enough so I don't get unaboob and that gross sweat in between but not too far that I feel like Madonna.  Running actually feels good again and I'm getting another one to wear every day.