This book is about the Buteyko method of getting free from Asthma without medicine, just by breathing properly and less. The idea is that carbon dioxide relaxes muscles and thus prevents asthma attacks, and by breathing less and correctly, you teach the lungs to hold more amounts of CO2 in rather than exhaling it out. I'm not sure about the validity of these claims, even after reading the book, because it is not a very scientific book as the author explains that there are only a few studies made(and those sounded bugious) - rather than making correct studies himself. Instead he uses short case studies of some people who apparently were helped. He also, as people do, blamed big pharma and the government for this method not to be as widespread as he think it should. I assume there is somehting to it and could try to implement some of the things to check out the effectivness of it all(like breathing through the nose, checking if it helps to hold breath when an attack is coming etc.), but mostly I had this looming feeling of pseudoscience at works. The book is also super repetetive, and say almost everything at least five times over. It is a quick and easy read though, but not enough to prove anything or convince me. I could drop this down to 2 stars, but I give it a pity 3.