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as a new diver should i be working on o2 or co2 training?
I know it seems like a "duh" sort of answer, however you should work on both.
O2 is more or less training you on holding your breath until you get uncomfortable, where as CO2 is training you to get past or push the discomfort part later on during your breath hold.
Don't think of it as "how much are I can hold for as long as I can hold it". Think of it more as "what gases are doing what, when AND how is my body going to react".
When you get to the point that CO2 levels start to rise, that is about the time that the Oxygen in you red blood cells can be released. That is how you extend your breath hold. So knowing how to get to and past that point is what you need to aim for.
Comfort is pretty much the goal. If you get tense, you won't hold well. If you get too uncomfortable to "focus" or "let go" (whatever helps you push through), you won't hold well.
So getting familiar and used to both O2 and CO2 training is how you'll get there.
Good luck. Hope that helped,
-Will