Pelvis drops on the unsupported side
Glute med on the stance side fails to maintain pelvic level.
Overactive muscles
TFLQuadratus lumborum
Corrective work
Foam RollTFL↗Foam RollQuadratus lumborum↗StretchQL side-bend stretch↗Glute med on the stance side fails to maintain pelvic level.
Lower back extends instead of glute finishing the rep.