Kim, My singing teacher taught me to expand my diaphragm without my stomach (lower abdominals) puffing out. It is also a more attractive style. Watch the classical performers, most use this technique. Basically, if you put your hands behind you about your waist, thumbs on your sides, as thought you were holding your kidneys, you should be in the area that you want to expand. As you inhale using these muscles, you may notice that your lower abdominals are pulling inward and tightening. Incidentially, you shoulders will not bounce up or down with this technique either. Your chest also stays in about the same place and may or may not be something you want. I personally don't like bouncing boobs. Give it a try since you are training yourself.

bflat