The information gained from a muscle biopsy should be shared freely with any freediver, imho.
Like I stated in my burnout thread, I wait until i've done at least 20 minutes of run/walking before I do any apnea running. I don't know if this qualifies for extreme hypoxic training, but I do it. The full effects would probably take some time to feel though.
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Far better it is to dare mighty things, to win glorious triumphs, even though checkered by failure, than to take rank with those poor spirits who neither enjoy much nor suffer much, because they live in the grey twilight that knows not victory nor defeat.
-Theodore Roosevelt-
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