You're absolutely right about the rib-cage expansion thing and there were a lot of ridiculous ideas connected to that practice which came all the way back to the "old-time" strongmen even before bodybuilding became a separate sport.

However, the pectoralis major is is involved also in internal rotation, flexion, abduction (past 90 degrees of arm abduction), adduction (below 90 degrees of abduction) of the shoulder joint as WELL as horizontal adduction.

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If you act sanctimonious I will just list out your logical fallacies until you get pissed off and spew blasphemous remarks.