Hips are not square — back hip opens outward
The back hip rotates away; the hip flexor stretch on the back leg is reduced.
Overactive muscles
TFLHip external rotators
Corrective work
Foam RollTFL↗Stretch90/90 hip stretch↗The back hip rotates away; the hip flexor stretch on the back leg is reduced.
Adductors and TFL dominate under the lunge base.
Upper traps elevate instead of the arms pressing tall with packed shoulders.