I found this book after trying to work out what was wrong with my breathing. I don't suffer from asthma, but following an extended period of stress in my life I had noticed that my breathing was very heavy and strained...lots of sighs, yawns and big gulps of air...and felt that this was contributing to me feeling continually exhausted and irritable. I looked on Amazon to see if there were any books on breathing and hyperventilating and came across this one. I'm so glad I did because it was a real insight into so many of my ongoing problems with my energy levels, stress levels, and breathing problems. I found it extremely reassuring to read the accounts of numerous other people in the book whose breathing had gone awry as a result of stress, and I welcomed the practical information on how to put my breathing right again. I've since purchased another book that focuses on the Buteyko technique and this has also really helped. I'm thankfully feeling much calmer and more energised nowadays...