In this respect, compensation  techniques (Vasalva maneuver, for example) immersion techniques (the duckdive in particular), finning techniques, learning diving signs, the physiology of apnea as well as elements about barotrauma (accidents due to pressure) and obviously the elements on safety, all seem essential to me to acquire.
My intention is not to decline them to you here, convinced as I am that it is not on Internet that one learns the practice of diving. For my part, I learned much at the time I passed my first diver(1st level CMAS in scuba diving) and I could strongly recommend this training which makes it possible to acquire the essential bases, even for the practice of free diving. By the attentive eye of a monitor who will be able to help you correct your defects before they are transformed into bad habits or worse still, into constraints.
Mastering certain techniques makes it possible to go down with a minimum of effort
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1- My point of view 2 - Apnea, freediving or snorkeling ? 3 - Freediving and photography : the material 4 - Practice of apnea 5 - Practice of underwater photoraphy 6 - Approaching fish
IN PRACTICE Practice of freediving A certain number of techniques and rules seem essential to me, to control, when one wishes to experience ones first meters under water.
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5 - Practice of underwater photography
Underwater photography and free diving
PHOTOGRAPHY AND FREEDIVING
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