One popular machine for targeting the row and rear delt muscles in bodybuilding is the seated cable row machine. This machine allows you to perform a variety of rowing exercises that target the muscles in your back, shoulders, and arms. To target the rear deltoids specifically, you can perform seated cable rows with a wide grip and focus on pulling the weight towards your upper chest while keeping your elbows out to the sides. This will help isolate and activate the rear deltoid muscles. Additionally, you can perform reverse pec deck flyes on the machine to target the rear deltoids. Sit facing the machine with your chest against the pad and grab the handles with your palms facing each other. Keeping a slight bend in your elbows, squeeze your shoulder blades together as you pull the handles back and out to the sides. Incorporating these exercises into your bodybuilding routine on the row and rear delt machine can help you build strength and muscle definition in your back and shoulders. Remember to use proper form, control the weight, and focus on contracting the targeted muscles for the best results.