has anyone here used this product for improvement of respiratory function? if so what is your assessment?
I’ve been using the cheap UltraBreathe for a few months now, my respiration improved, I feel the difference on the bike when doing hard/long intervals, I’m not limited by the lack of oxygen. Now I only feel the pain in the legs 
I learned about that kind of devices from a speech from Dr. Guy Thibault; if you can read French, here are 2 links to short articles on the subject:
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thanks for the feedback—unfortunately i am unable to read French. I am interested in this product not only for myself but also my clients/patients. For three application avenues. For physiologic performance of cycling and other endurance sports as well as behavior health benefits and marksmanship performance.
Well, just by reading the comments on Amazon, I see a lot of people with different types of health problems, who improved their condition by using that product (bronchiectasis, asthma, fibromyalgia, respiratory problems after accidents, and so on). And obviously, some athletes post comments about their improved capacities for endurance and/or high intensity intervals. Even divers are training with that “tool”.
I’m using it. Bought it in spring, also for the possibility to train the lungcapacity in case of a Covid 19 infection. Can’t say it because of this, but I have improved my 5 min power (VO2 Max) and also raised my FTP. Lungcapacity is raised from 4,5 ml to 5 ml. Measured by the beloing app, so not certified.
Stig who have the Company, has written a book about the technic and philopysi behind. He is also WR holder in breathing underwater.
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He’s a fish ? 
Maybe! Can you hold your breath underwater in 22 minuts.??
Fish don’t hold their breath ! Mammals do. Like whales and dolphins…
