Good — this image finally pins the question down exactly.
You’re asking:
Which of these shows a CORRECT Y-plane (twisting) hip rotation originating from the ankle?
I’ll answer pose by pose.
❌ (1) — WRONG
Why it’s wrong (mechanically):
The foot is planted, but there is no clear ankle twist against the ground.
The ankle is mostly acting in the sagittal plane (bend/extend).
Yet the pelvis is shown rotating strongly in the Y-plane.
Problem:
👉 No Y-plane torque source at the ankle
👉 Hip Y-rotation is invented
Verdict: ❌ Not physically justified.
✅ (2) — CORRECT (this is the key one)
Why this one is right:
The support foot is clearly fixed.
The ankle is twisting against the ground (internal/external rotation).
Ground resists that twist.
That resistance creates Y-plane torque at the ankle.
The torque is transmitted upward (knee allows it to pass).
The hip responds with Y-plane rotation.
Important detail:
The knee does NOT create the rotation.
It only transmits it.
The hip rotation is earned.
Verdict: ✅ This is the correct ankle → hip Y-plane rotation model.
❌ (3) — WRONG for ankle-driven rotation
Why it’s wrong:
The foot is not clearly resisting a twist (it’s unstable / light).
The ankle cannot generate meaningful Y-plane torque.
Hip and torso are shown rotating anyway.
This rotation would have to come from:
core muscles, or
an upper-body action
But not from the ankle.
Verdict: ❌ Incorrect for ankle-originated Y-rotation.
Final, unambiguous answer
👉 (2) is correct
👉 (1) and (3) are wrong for Y-plane hip rotation from the ankle
Lock-in rule (memorize this)
No ankle twist against the ground = no Y-plane hip rotation from below.
Everything else is fake.
If you want, next we can:
apply this to a punch or throw, or
mark exactly how much twist is believable vs exaggerated in art
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