I just downloaded the app and totally love it. Immediately I stopped slouching next to my computer and the breathing brings enhanced clarity to mind. I started the app with the default setting and the breathing was pretty quick. Then I slowed the app down and the breathing become really slow. For 99 cents this is a really nice tool and a great way to relax.
You can find it by searching long deep breathing on the iphone app store or through itunes
This link will open the itunes application on your computer.
Let me know how you like the app.