Set the cable pulleys on each side of the cable system just a notch or two below the highest notch.
You can use single handles for this exercise, or don’t attach anything to the cable and just grab onto the little ball at the end of the cable.
Keeping a slight bend in your elbows, pull both cables back in a reverse fly motion.
Once you feel a good squeeze in the back of your shoulders, slowly bring the cable ends back to the starting position. There should be a slight bend in your elbows throughout the entire movement.