Go on — do a rep.

Drag the slider. That's the whole idea: movement you can hold in your hands.

Enable JavaScript to scrub the rep yourself — or open the full player to see it play.

0:00 Loading… 0:00

Playing on its own — grab the slider to take over.

What you just dragged wasn't a GIF. Here's what actually ran.

1
Computed movement. Every position on screen is solved from clinical joint angles by a biomechanical model — nothing was filmed.
2
Feet pinned by IK. Planted contact points are held by inverse kinematics, frame by frame, not hand-drawn.
3
Joints ROM-clamped. Motion can't leave normative range-of-motion limits — the slider can't break the anatomy.

Not convinced? Here's the actual app.

This is the real embedded player, not a mockup — the same iframe a clinic site would drop into its own page.

/embed/glute-bridge

Same engine, different data. Tap one — the figure at the top updates live.