Learn to dissociate mouth and nose breathing circuits in the water in order to independently control inhalation through the mouth and exhalation through the nose.

* Lie flat in the water, with your face immersed using the snorkel
* Take the correct head position (reference D-6.1)
* Let the body float without tension

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* Inhale through the mouth
* Hold the breath
* Exhale through the nose

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Then:

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

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Next, explore different modes of exhalation:

* Inhale through the mouth in several small successive breaths
* Exhale through the nose in pulses (exhale – hold – exhale – hold)
* Exhale slowly and continuously through the nose
* Exhale forcefully through the nose (as if blowing your nose)
* Move from a slow exhalation to a strong exhalation
* Move from a strong exhalation to a very fine stream of air
* Produce the thinnest possible stream of air through the nose, then hold and restart
* …

* Inhalation is done only through the mouth
* Exhalation is controlled through the nose or combined mouth + nose
* The different exhalation modes are explored deliberately
* The phases of holding and resuming are controlled
* The head position remains stable and aligned
* The body remains relaxed during the exercise

* I clearly dissociate inhalation through the mouth and exhalation through the nose
* I voluntarily control my airflow
* I vary the intensity and rhythm of my exhalation
* I precisely feel the airflow at the level of the nose
* I remain relaxed despite variations in breathing
* I maintain the correct head position during the exercise