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The hinokami auto breathing trainer is something you've probably seen floating around fitness forums or anime fan groups lately, and it's honestly one of those rare gadgets that manages to bridge the gap between "nerd culture" and actual, science-backed health. If you're a fan of Demon Slayer, you'll recognize the name immediately. But even if you've never seen a single episode of Tanjiro's journey, there's a good reason why these little devices are starting to show up in the gym bags of runners, swimmers, and even people just looking to manage their stress levels a bit better. ...