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I hadn't realised quite how important this flexibility issue was until I took the sled well past the point of my lungs feeling completely empty.
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What is this depth (depends, but..)? How similar that feeling is if you compare it to pool & negative dives? At least there's one difference, in pool you really do not have any air, in open water you have, you just feel you don't. That must be psychologically different.
I've never done any CW and I'd also like to prepare well to next summer... I think Frenzel tech will give me ability to equalize (air in my mouth, don't have to take it from lungs), but I want to avoid diaphgram muscle failure etc.
Juha
