Squatting instead of hinging
Knees bend too much; the cable becomes a squat and the hamstrings disengage.
Overactive muscles
QuadricepsHip flexors
Corrective work
Foam RollHip flexors↗StretchHalf-kneeling hip flexor stretch↗Knees bend too much; the cable becomes a squat and the hamstrings disengage.
Erectors extend past neutral at the top of the cable RDL.