Turn the seated torso while the pelvis and stool stay facing forward

Original, untested video brief. No input image or generated result is supplied.

1. Task and boundary

Show the shoulder line turning relative to a seated pelvis, then returning to face forward. Keep the stool, waistband and both feet visible so the motion cannot be explained by a swiveling seat or a full-body turn. The head may follow the chest, but a head turn alone is not enough; the shoulder line must change orientation relative to the lower body.

Use a modest turn in one direction and a return, with no reach or arm gesture. The forearms can remain loosely crossed against the chest to keep their motion tied to the upper body. Do not ask for an extreme angle or use the result to infer spinal flexibility. This is a visual relationship between two body regions, not a prescribed stretch or mobility test.

2. Authorized first frame

Provide an authorized photograph or illustration of a consenting adult sitting upright on a stable, non-swiveling backless stool. Use a slightly elevated frontal three-quarter view that shows the shoulder line, waistband, thighs, seat edge and both feet. Begin facing forward, with feet resting on the floor and forearms loosely crossed in front of the chest.

Choose clothing with a readable waistband and a simple chest seam. Avoid a jacket draped across the entire lap, a rotating office chair or a close crop that removes the seat. Let the stool legs and floor marks provide fixed references. Both thighs should keep their starting direction through the planned motion; they are useful evidence that the pelvis has not turned with the chest.

3. Use the generator

Open the current image-to-video generator in a mode accepting your authorized first frame. Paste the complete prompt, check the available settings and cost estimate, then submit only when ready. This page supplies text; it does not upload an image or start a generation.

4. Prompt and timing

Start from my authorized image of the same adult seated upright on a fixed backless stool, pelvis facing forward, both feet planted and forearms loosely crossed against the chest. Lock the camera and stool. Turn the upper torso gently toward the person’s left while keeping the waistband orientation, thighs and seated contact in their original positions. Let the shoulder line and crossed forearms turn with the chest; let the head follow that small turn without making a separate large look over the shoulder. Show a brief readable difference between shoulder direction and pelvis direction. Then return the chest and shoulders continuously to the original forward-facing pose. Preserve the body proportions and original clothing. Do not swivel the stool, slide the hips, move the feet, detach the torso at the waist or replace the motion with an arm reach. No cut or camera orbit.

Opening: establish the forward-facing waistband and thighs, seat contact and starting shoulder direction.
Middle: compare the changed shoulder line with the unchanged lower-body references and stool legs.
Ending: follow the return until the chest and pelvis face the same starting direction again.

These beats are author suggestions, not exact model timing guarantees. Adapt their proportions to the clip length actually available.

5. Inspect the output

After inspecting your own output, record a time or frame, visible observation and pass, fail or inconclusive judgment for each condition. A convincing ending alone does not verify the preceding action.

The shoulder line changes direction relative to the waistband and thighs.
The pelvis remains seated in the same place without sliding or turning with the chest.
The stool and its legs stay fixed relative to the floor marks.
Both feet remain planted and the crossed arms follow the chest without a separate reach.
The waist stays visually connected through the turn and return.
If clothing hides the waistband or seat contact, mark pelvic stability inconclusive rather than assuming it.

6. Fix one failure

The stool swivels: use a visibly fixed stool and name its legs as stationary references.
Only the head turns: specify the chest seam and shoulder line as the moving features.
The hips slide to fake the turn: keep the seat edge and thigh direction visible in the input.
The body splits at the waist: reduce the angle and preserve a continuous torso outline.
The arms reach out: retain the original loose crossed-arm pose and remove reaching language.

7. Ending and limits

Finish seated as at the start, chest forward, pelvis unchanged and both feet still resting on the floor.

Save your own generated result through the available result controls, together with the authorized input, exact prompt, settings and inspection notes.

No generated result, spinal measurement or movement trial is supplied. Visible alignment can support a limited continuity check but cannot establish joint loading, safe range, comfort or flexibility. Hidden seat contact remains unverified.

Compare upper-body direction with Standing bow: a hip hinge, a pause and one return, which changes the torso’s forward inclination. Side-view sit to stand: follow the support points instead changes seat support. Here the chest turns sideways while the pelvis keeps its seat contact. Retain both the orientation references and the seat edge to prevent an apparently plausible turn from hiding a slide or rise.