Hips rock side to side with each tap
Anti-rotation core fails; obliques can't resist the unilateral load.
Overactive muscles
ObliquesTFLQuadratus lumborum
Corrective work
Foam RollTFL↗Foam RollQuadratus lumborum↗StretchQL side-bend stretch↗Anti-rotation core fails; obliques can't resist the unilateral load.
Body rises to reduce the difficulty of the single-arm hold.