S.F.
Please don't obsess about your flat chest - you are a fitness trainer and far better off without the extra load! I felt the same after having my second child, but soon realized I was a lot better off being able to wear a sports bra while breast feeding, and now after having three am able to be far more active and am far healtheir than most women in their late forties (and younger). You are a great being a great example for the rest of us! God bless! S. (an older mom still running and XC skiing who can keep up with her kids)