This series on squatting has been about maintaining proper spine positon and bracing during the movement. It has had a specific focus on the often overlooked importance of eliminating thoracic spine extension. To date, we have covered how to create the stability to brace the spine and generate deep spinal stabilization. This starts with the process of creating the correct intra-abdominal pressurization. The second piece in this series covered what you can do to determine the correct hand position based on your current shoulder mobility, and then you use that hand position to improve your squat through incorporation of the lats. In this final piece of the series I will discuss some of the science behind the approach I have been outlining.