The Martial Unity - Chapter 75: The power of deception

... them against resistance, usually a weight load. One would shift weights by expanding and contracting particular muscle groups across the body, leading to them growing stronger over time.

The diaphragm was no different in this regard. Rui spent a lot of time inhaling and exhaling through a breathing contraption that severely hindered breathing, this meant the user had to push his diaphragm to the absolute limit if he or she wanted to breathe normally.

As Rui gasped and wheezed during ...