ZTAngel advice:
I hear women say all the time, "I don't work out my chest because I don't want to lose my boobies!!!!!!"
Guess what breast tissue is made out of? Fat. Guess what you lose when you do cardio? Fat. If you're working out regularly, you will lose fat and, yes, you may lose your breasts as well. The good thing about working out your chest is that it builds up your pectoral muscles which is what your breasts sit on. Working out your chest muscles will make your breasts perkier and will make them appear bigger.
I had to make this post because I just overheard two of my female co-workers discussing how they don't work out their chest muscles because they don't want to lose a cup size.