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Recognising that signal when to stop can take time. For me it's usually a contraction of the diaphragm.
I'm still a little unclear as to the instructions... I can definitely hold a little longer, I think, but then I would probably be "gasping for air" etc
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Your breathing should be normal after the breath hold. Sometimes, I miss the mark by ~two seconds, and it takes me two or three breaths to regain my composure.
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