One of the funniest concepts that you can "expand your rib cage" 
Arnold was a pioneer in bro-Scientology.
Great exercise nonetheless
Well, if you do it right, it will work, but you need to be under 30 years of age. After that you are done, your bones doesn't grow anymore. When you look competition swimmers, it is obious that exercise can change your structure. Have you seen many top swimmers with narrow shoulders and small ribgage? Most of them has wide shoulders and big chest. They may look small in he pictures, but in real life they are tall and wide.