Equalization – Eustachian Tube opening in the BTV maneuver

Eustachian Tube opening represents a particular combination of head posture and muscles action.
During these years we observed and analyzed hundreds of freedivers who learned to equalize Hands Free and we identified at least 8 ways to induce Eustachian Tube opening. 

In this video Federico Mana shows these 8 ways:

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Your questions and Federico’s answers:

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