Position back against back pad with knees slightly bent, shoulders back, and chest high. Place cable straps over shoulder. Hold against front of body with opposite hand so that cable is taut. If available, place hand in rope slot that allows cable to be taut when hand is in position with shoulders back.
Flex and twist spine so shoulder pulls strap diagonally forward and downward away from pulley. Return until back of shoulder returns to back pad and repeat.
To allow for full range of motion, grip height on strap should not allow weight to bottom out (weights touching stack) when shoulders are back. Padded hump should be adjusted to height of low back. See Spot Reduction Myth.