Breathing involves an overlooked muscle - the serratus posterior inferior.
I could not run without hyperventilating.
In my research, I linked a pelvic imbalance which was charaterized by a adductor longus(L), psoas (R) which caused a torsion to the spine or an attempt at a rotoscoliosis. This triggered reposnses from the serratus pos inf (R) and QL (L). The result was breathing problems. This has been missed in much of the research, which focuses on other breathing related disorders.
The serratus pos inf creates the desire in the patient to be a belly breather. Treat the cause - pelvic angle problems, APAS, and the belly breathing will be considerably reduced and the person will start to rib breath again. Breathing problems will be reduced as the force against the serratus is deminished..
Hope this is helpful.
Best regards,
Neuromuscular