Great video. What a pity we can't read the contact details at the end of it - at least not on my screen. I'm going to put a link to this from my blog for The School for F.M. Alexander Studies in Melbourne.
Pushing your abonimal muscles in and out whilst holding your rib-cage rigid has nothing to recommend it and will not improve bad breathing and will ruin good breathing if you continue with it.
this is the very best of the Marj Barstow videos