Learn to correctly position the snorkel and memorize the proper head posture through proprioceptive sensations (sensations coming from inside the body. Here, attention will be focused on sensations in the neck and the double chin).

* Place the head bracket on the forehead.
* Pass the strap around the head without compressing it.
* Position the silicone mouthpiece in the mouth.
* Adjust the angle of the mouthpiece if necessary.
* Adjust the height of the head bracket if necessary.
* Stand upright and look straight ahead.

* The gaze is directed forward.
* The chin is neither lifted toward the sky nor lowered toward the chest.
* The neck is slightly drawn backward.

* I am aware that I am looking straight ahead.
* I feel a fold of skin under the chin (double chin).
* I perceive the internal sensations of the neck when I gently draw it backward.