Pelvic and Rib Positioning

The drill reinforces proper pelvic and rib positioning. The stack is not treated as a rigid posture but as a starting relationship that expands movement options. The stack refers to the relationship between the thoracic and pelvic diaphragms. The posterior pelvic position puts the lower back against the chair back. Losing lower thorax position in hand-supported exercise can shift load toward the upper extremity and increase wrist pressure. The stack is the relationship between the thorax and pelvis that aligns the thoracic and pelvic diaphragms for pressure management. Thorax-pelvis stacking is the alignment of the lower thorax over the pelvis so abdominal tension and multidirectional breathing can be maintained. A slight back-pocket tuck helps position the pelvis and low back so the torso is better stacked. Keeping the lower ribs still during inhalation reinforces the posterior pelvic position. A preserved stack allows the thoracic and pelvic diaphragms to oppose each other and maximize pressure regulation. A stacked position is intended to support multidirectional expansion of abdominal contents during breathing. Pelvic movement during stacked breathing should include counter-nu…