I have been training Buteyko breathing for many years. During this time I have tried many different versions of Buteyko breath work. I can say that this app by far outperforms the other methods. On top of that, it is very nice to no longer need to take the additional time and energy to manually type in the results from each breathing session, as this happens automatically. I totally love that I can check my graph immediately after each session! What a luxury to get a graph so easily. The graph is also very clear. The voice of the narrator is also very calm and soothing. I find that I am looking forward to the sessions and I love having the control of choosing levels myself based upon how I feel. It adds a layer of flexibility that makes the process a lot more fun. And all this almost for free! This is modern technology at its best, supporting people's healing process, making it a lot easier to reach that goal of hitting a 60 second CP!!! :)