Singing and posture–see Categories, About, Launch 4-2014

The question is asked whether the rib should be expanded. 

 http://www.punbb-hosting.com/forums/themodernvocalist/viewtopic.php?id=586

 The question, in my opinion, should not be whether to keep the ribs deliberately expanded, but, instead, how to have the rib relaxed and in tone, which, in my opinion, is usually is a far more expanded state.  Your singing state should be its ribs in muscular tone state and adjusted for the emotional effect your singing is trying to achieve.

The reason the ribs are usually not in a relaxed and in-muscular-tone state is because of posture problems and emotional tension.  These are difficult to fix, but if fixed, the result will be an expanded chest, similar to what is described frequently in professional dance classes.   It is also possible to attain an expanded rib similar to that in a military stance, but this often produces lesser varieties of emotional sounds.

 Interesting how the words musical tone and muscular tone are related—this is what http://www.vocalposture.com is stating.