@FP26
the way I see it. The obliques pull the upper body around, while the upper(rib cage)returns the favor pulling the obliques and hips into extension. Hip decel (posture) is what stops the upper and propels the arms/hands. Hip extension is the result. Basically the upper slingshots off the pelvis deceling the pelvis. Pulling everything up and into extension. For me the hands set the plane, the posture maintains it. Jmho.
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Do you think Tatis is swinging down?