This is a fantastic idea. Breathing is so important for our health and most people take it for granted, developing bad habits which can lead to all sorts of health problems.
If you've never done so, go to YouTube and find a good hour long breathing exercise. I guarantee that at least half of people will feel a significant positive effect on their well-being.
Your breath is tightly linked to your central nervous system. As your breath changes in response to your mental condition, so can you effect your mental condition by controlling your breath.
But more than that, modern diet and lifestyle has deformed our sculls and given us bad habits like mouthbreathing which have negative impact on everything from posture to gut and organ health.
Everything health related starts with breathing property.