**A single continuous side-view shot in a home hallway.
An elderly man with gray hair, wearing a light blue shirt and dark pants, stands still in profile.
He is holding a colorful plastic spine model in front of his chest.
At the beginning, he stands straight with good posture.
His head is upright, shoulders pulled back, chest open.
The spine model is straight and vertical.
Slowly, over time, his posture changes.
His head moves forward.
His shoulders roll forward.
His upper back curves downward.
At the same time, the spine model bends forward to match his body posture.
By the end, he is clearly hunched over.
His head hangs forward, shoulders rounded, back curved.
The camera does not move.
The background stays the same.
No text, no graphics, no labels, no transitions.
Realistic motion, educational demonstration style.**