justbreathe gives you alerts in a gong sound to breathe deeply, down below your naval. This exercise allows you to breathe into your sacred center of energy. The gong sound is a way to get you to relax and breathe. By doing this exercise, you will have a powerful influence on your respiration and on the way you breathe in the many conditions of your life.
This app is free, but you have to open it once per 28 days to renew your alerts.