Detoxification. Diaphragmatic breathing is the best way to move lymph out of the body. 

Mental health. Breathing in a way that stimulates vagal tone and puts you in a calm parasympathetic state, both of which support emotional wellbeing.

Stress reduction and mindfulness. A regular breath and meditation practice help with reducing stress and encourages a  positive mental attitude. 

Reduce fatigue and pain. Research shows breathing exercises significantly help with energy levels and mitigating pain. 

Healing lungs. Maximizing lung capacity and strengthening breathing muscles can have a significant positive impact on breathlessness that occurs because of lung stiffness and difficulty absorbing oxygen into the bloodstream.