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My endurance is pretty lousy, and has been since I was a child. I overheat quickly, and it's not hard for me to get out of breath (it's improving a bit, with me doing running more often). One of the things I started doing several years ago, was forcing myself to not hyper-ventilate when out of breath, but rather keep a steady rhythm, and try to take in and put out more air. Occasionally, this has backfired, with me finding that I need to stop exercising for a bit because I'm greying out from not getting enough oxygen, but usually it's sufficient to breathe steadily during exercise even if I continue to feel like I'm out of breath.

I've read a few articles on competitive breath-holding where they state that the practice of doing it sometimes involves less the ability to get by with less oxygen and more teaching your brain to ignore the warning signs of oxygen deprivation, leading to problems like shallow water black-outs because you feel fine right up until you pass out. Obviously, above water, this is a bit less dangerous (although I do generally try to avoid passing out, and instead cease the exercise, or let myself gulp breath if it comes down to that). That said, is there any danger that I am, like the underwater breath-holders, masking the symptoms instead of improving my condition by forcing myself to breathe slowly?

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    I don't have access to my books at the moment so can't go into details, but think of it like this; it takes time for the lungs to absorb the oxygen from the air we breath, this is why people can collapse after hyperventilating, they aren't leaving the air in their lungs long enough for the o2 to be absorbed. Breath holding underwater is also different than on the surface because of the mammalian diving reflex. Lastly, it's the level of co2, not o2, in the body that tells us we need to breathe. – Dark Hippo Apr 12 at 8:32
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It depends. Read thoroughly invitiation for this seminar: https://www.strongfirst.com/special-events/second-wind-pavel/ - there is some information about research on this topic.

It seems that what you are doing can be really benefical, but also it can be pretty dangerous. It depends on lots of factors, some of them stronly individual. I do not think anybody can advice you with this over internet.

If you want to do it correctly, you probably need to be examinated by expert.

Or you can try to continue, very carefully, and measure if this approach help or not. Or even more carefull - practice it if you not exercise - try to inhale and exhale resonable slow for few minutes every day. This exercise should be safe for the most of the people.

However, do not expect that such an exercises do magic with your "lousy endurance". It would probably need more direct approach. I would suggest this book as a good place to start:

Maffetone, Philip. The big book of endurance training and racing. Skyhorse Publishing, Inc., 2010.

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One thing I was taught during my martial arts tenure growing up was to slowly breathe in through the nose (like two or three seconds) and breathe out the mouth (again two or three seconds). This is something that my personal trainer encourages as I exercise nowadays.

However, my fitness level and cardiovascular health are not as good as they were when I was younger. Every time I exercise I at one point feel like I'm not getting enough oxygen doing the slow breathes so I take some "cheater" breathes to get my mind calm down. Then I return to controlled breathing to return to my body to a more normal state or homeostasis. (Bear in mind that this is all anecdotal so take with a grain of salt)

After some time of consistent exercising, your endurance should get better and this feeling of out of breath will decrease more and more. If after several weeks to a couple of months of no improvement, there may be a medical issue and consulting a doctor would be good. Until then, keep hitting the pavement/gym. :)

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