When using the box to support the spine during extension movements, which cue best supports safe alignment?

• A. Keep the pelvis anchored to the box while the spine extends in a controlled sequence.
• B. Let the pelvis move freely while the spine extends, to gain more range.
• C. Move the gaze only and ignore pelvis and spine alignment.
• D. Allow the lower back to extend excessively without control.

Answer: (B)

Coordinated movement between the pelvis and the spine is essential when using the box for back extension. Allowing the pelvis to move with the spine helps the extension unfold in a controlled, natural sequence rather than forcing a rigid position. When the spine lengthens from the upper back and the pelvis follows its own small, controlled tilt, you avoid overdoing lumbar extension and reduce compensations that can strain the lower back. Keep the abdomen engaged and the rib cage stable so the movement stays organized and safe, with the box providing support for the upper spine rather than locking the pelvis into a fixed spot. This approach promotes a safer, fuller extension by honoring how the pelvis and spine should work together during the movement.