How can I effectively target my rear deltoid muscles using a cable machine during a workout?

To effectively target your rear deltoid muscles using a cable machine, adjust the pulley to shoulder height, grasp the handle with an overhand grip, and pull the handle towards your chest while keeping your elbow slightly bent. Focus on squeezing your shoulder blades together at the end of the movement to fully engage the rear deltoid muscles. Repeat for desired reps and sets.