As means of relaxation in the middle of my local, personal tornado, my partner told me about an iPad (or is it iPhone? It works nicely on my iPad) app which I find very comfortable and quite pleasing aesthetically as well. It feels like opening the windows in the basement and it occurred to me that my breathing muscles are a bit out of shape too. The good part is that five minutes of exercise feels just wonderful. It is recommended by Harvard Medical School too:)
http://www.breathing-zone.com/