Another famous example would be the japanese ama divers. Humans are surprisingly good underwater. 4 min. should be attainable for most people - just staying underwater, not exerting yourself ldo. There are reports about apnoe divers "slowing down their heartbeat" and they make it sound like a superhuman power. Everyone's heartbeat slows down once you go underwater for more than a couple of seconds. I'm sure you can train to stay more relaxed, but it's nothing magical.



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