What muscle would allow you to bring more air into your lungs

The diaphragm is the primary muscle that allows you to bring more air into your lungs. It is a dome-shaped muscle located at the base of the lungs. When the diaphragm contracts, it flattens out, increasing the volume of the thoracic cavity and allowing the lungs to expand. This creates a negative pressure within the lungs, drawing air in. The contraction of the diaphragm is the main mechanism of inhalation.