What are the proper form and technique for performing machine reverse flies to target the rear deltoids effectively?

To perform machine reverse flies effectively for targeting the rear deltoids, sit on the machine with your chest against the pad and grasp the handles. Keep a slight bend in your elbows and exhale as you pull the handles back, squeezing your shoulder blades together. Slowly return to the starting position while inhaling. Maintain control throughout the movement and focus on engaging the rear deltoids.