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Thanks. i'll try to look up vasalva as i do not know what that is (i am very ignorant)The technics differ, everybody can do valsava equalization, but usually only trained freedivers know to perform Frenzel equalization properly.
While VTO and mouthfill are advanced technics for AIDA3 certified freedivers, and is required for VWT, and +30m CWT.
google stage A and stage B freediver manual by apnea international, they are available for download unlike AIDA2 and AIDA3 manuals.Thanks. i'll try to look up vasalva as i do not know what that is (i am very ignorant)