Rounded upper back off the blocks
Thoracic flexion under the elevated heavy load.
Overactive muscles
Pec majorUpper trapezius
Corrective work
Foam RollPectorals↗Foam RollThoracic spine↗StretchDoorway pec stretch↗Thoracic flexion under the elevated heavy load.
Lean-back past vertical at the top of the block pull.