ballet_lover_nc, you can edit your own posts and correct a typo or anything else you want to fix by clicking on the Edit button at the bottom of your post
Actually, Juliet did answer your question about bustline, and I answered the other question. She said that dancers have a low percentage of body fat, and they are in such good shape that most of them do not develop large busts, although they do develop. Those who develop more have to take some measures in terms of their attire, either in class or on stage, to control it. As most dancers are in serious and intensive training during the developing years, they tend to remain thinnner than most teenagers and develop less fatty tissue overall.
As to exercises to improve as a dancer, those are way too numerous to list in this format, however there are a number of threads about this on the Young Dancers board and in the archives. The main answer is, however, CLASS. The work you are taught in class is how you improve as a dancer. Taking daily, or almost daily, technique classes with a professional teacher is essential in the development of a dancer. Additional stretching and specific exercises for your needs should also be learned in your classes and given to you by your teacher. There is no magic pill for ballet, no potion that will change your body and give you placement, turnout, great feet, super flexibility, musicality, artistry, or anything else. It starts with natural ability and develops with professional training.