Gary McGrath training in the pool

Our friend Gary McGrath went through his AIDA Instructor training with us and his final presentation was about 

Shallow Water Conditioning for Depth and Diaphragm Conditioning for Freedivers

It's a lovely read looking at preparation for the pressure and general big-hug-from-the-sea feeling we are exposed to at depth - and that preparation without having access to said depth. This preparation will make a big difference towards staying far away from sqeezes (ear, sinus, trachea or lung barotrauma) and enjoying your limited time at depth just that much more.

This one is for all of you pool freedivers in cold-water and landlocked exile with some excellent suggestions.

Emma Bryce's video is a great, concise visualisation of the basic understanding of how lungs work. Taking a look at the roles of Carbon Dioxide (CO2) and Oxygen (O2) in our breathing, it prepares us well for a beginners' freediving course and may well fill in some details even for advanced freedivers.

This has been bugging me for a long time. - (UPDATE: We have been able to trace this back to 2011 at least.)

Decompression related injuries (DCS) have become a significant factor in advanced freediving and one way of reducing the risk of DCS is to work with well-defined surface intervals.

How to calculate this surface interval is the logical question. We do not have the tables established in the experimentation done for scuba divers and very little hard data to go by. So rules of thumb were created to at least have some idea.

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