Do you believe the ballet body is an essential part of being a professional ballerina?

Absolutely. :) It looks right, and effects the way they move too. Someone with chubby legs isn't going to be able to soar through the air like someone with thin, lean legs. Long arms look better when dancing en pointe. The small head and long neck create an elegant look that goes well with the skimpy clothing and skinny body. Lastly, someone with huge boobs or extra fat on their stomach just won't move as gracefully.