Lumbar hyperextension at the top
Lower back extends past neutral; glutes never fully contract.
Overactive muscles
Erector spinaeHip flexors
Corrective work
Foam RollErector spinae↗StretchHalf-kneeling hip flexor stretch↗Lower back extends past neutral; glutes never fully contract.
Adductors and TFL overpower glutes at full hip extension.
Foot placement too close to the hips shifts the drive to the calves.