It's pretty hard to describe my contractions. The first few are very subtle (and I don't actually count them as contractions), kind of like you trying to breathe with your mouth closed. As time progresses, they become more and more clear. The best description I can come up it is involuntary breathing motions of the diaphragm. Towards the end they're very strong and cleary visible to anyone watching me.
When to quit is also very very individual. I'm lucky enough that my breathing reflex works pretty good in that sense. I just stop when the urge to breathe becomes so strong, I cannot resist it. For some there's no such warning, and they have other "signs", such as changes in hearing or vision, losing clearness of thought etc. It's something you'll have to find your self. Just remember that diving alone conservatively is dangerous enough. "Finding your limit" without a buddy would be suicide. Just a warning...
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Simo K
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