You need a cite to understand that the bellows of the ribs might be constrained by tension held in the intercostals and shoulder girdle? Lol. Here ya go. htt

You need a cite to understand that the bellows of the ribs might be constrained by tension held in the intercostals and shoulder girdle? Lol. Here ya go. https://academic.oup.com/ptj/article/86/3/345/2805157 https://academic.oup.com/ptj/article/86/3/345/2805157 The diaphragm is also a muscle, and can be trained. https://www.sciencedirect.com/science/article/abs/pii/S1746068914000650#:~:text=Our%20results%20demonstrate%20that%20diaphragm,respiratory%20pressures%20and%20pulmonary%20function https://www.sciencedirect.com/science/article/abs/pii/S17460....