Spine, neck and head
Looking forward, tipping back and sliding forward are not the same movement.
Separate bending, turning and translating the head relative to the trunk.
Cervical flexion brings the chin toward the chest; extension tips the head back. Rotation turns the head, and lateral flexion side bends the neck.
Protraction and retraction move the head forward or backward relative to the trunk. Cat-Cow contrasts spinal flexion and extension.
This is a small movement demonstration, not an additional pose-library module.
Four changes at the head and neck
Bending, turning, side bending, and sliding are shown separately.
This is a simplified learning diagram. It is not a reviewed anatomical illustration.
Low Cobra
Use small, clearly separated demonstrations. Keep the trunk reference visible. Compare a neutral-length neck with the displayed flexion example.
Slide your head backward over your neck without tipping it, then tip it and notice the difference.
Notice: Sliding and tipping produce different feelings and need different words.
This is noticing, not instruction. Move as little as you like, stop at any point, and watching instead of moving is a complete way to take part.
Which word describes turning the head left or right?
Pause before opening Practice. Say the distinction in your own words.
Does placing a forehead on a surface, by itself, tell you the exact neck position?
No end-range neck challenge, forced head-back cue, universal retraction prescription or inference from forehead contact alone.