That is the basic practise. And then after that we do the practise of no breathing, which means you must know your own breathing. As I can feel myself, better breathing has a lot of implications. The influence of good breathing for health, well i suppose that good breathing helps to keep good health. For the emotional part too.
Many people don t notice when they are breathing in a wrong way.
Clearly, when you are breathing in a wrong way, your emotions are disturbed. So with practising good breathing your emotions become clear and undisturbed. Emotion is a movement in the body provoqued by or related to the movement of the diaphram. When this reaction is not harmonius then the part which is not harmonius must be expressed by the movement in the body. So in a way to have emotions is always very good.