Lumbar extends instead of hip
Lower back arches to complete the range; glute never fires.
Overactive muscles
Erector spinaeHip flexors
Corrective work
Foam RollErector spinae↗Foam RollHip flexors↗StretchHalf-kneeling hip flexor stretch↗Lower back arches to complete the range; glute never fires.
TFL and glute med substitute for glute max.