It doesn't matter what brand of equipment you use or from what 'school' of Pilates you graduated. The Short Box Series is found in all of them. Why? Because the SBS develops the full movement potential of the spine.
Flexion - Extension - Rotation - Lateral Rotation
Once your spine understands how to move more advanced exercises become accessible. I'll take you through the finer details of the SBS that show up across the method and the Reformer.