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

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)