What happens during exhalation in the breathing cycle?

During exhalation in the breathing cycle, the diaphragm indeed relaxes, leading to a decrease in the volume of the thoracic cavity. When the diaphragm, which is a dome-shaped muscle located beneath the lungs, relaxes, it moves back to its original position, which reduces the space in the chest. As the volume decreases, pressure inside the lungs increases relative to the outside atmosphere, causing air to be expelled from the lungs.

Understanding this process is crucial in practices like BASI Pilates, where breath control is an integral part of movement and alignment. Correctly timing the exhalation can enhance the effectiveness of exercises and support the engagement of the core muscles. While other options describe aspects related to breathing or abdominal movement, they do not accurately depict the process occurring during exhalation itself.