Learn to dissociate the breathing pathways of the mouth and nose.
The objective is to independently control inhalation through the mouth and exhalation through the nose, in order to better manage breathing with the snorkel.

* Position yourself with the head posture from Exercise 1A.
* Inhale through the mouth.
* Hold the breath.
* Exhale through the nose.

Then:

* Inhale through the mouth.
* Exhale simultaneously through the mouth and the nose.

Next, explore different rhythms:

* Inhale through the mouth with several small successive breaths.
* Exhale through the nose in bursts (exhale – hold – exhale – hold).
* Exhale slowly and continuously through the nose.
* Exhale strongly through the nose (as if blowing your nose).
* Transition from a slow exhalation to a strong exhalation.
* Transition from a strong exhalation to a very fine airflow.
* Produce the thinnest possible airflow through the nose, then hold and resume.

* Inhalation is done only through the mouth.
* Exhalation can be controlled through the nose or combined mouth + nose.
* Different breathing rhythms are intentionally explored.
* Breath-holding phases are controlled.
* The body remains relaxed during the exercise.

* I am able to clearly dissociate mouth and nose.
* I voluntarily control my airflow.
* I can vary the intensity and rhythm of exhalation.
* I precisely feel the airflow at the nose.
* I remain relaxed despite breathing variations.