The Pectoral Fly/Rear Deltoid Machine is a piece of exercise equipment that targets the chest and rear deltoid muscles. It typically consists of two arms that move in a circular motion, allowing you to perform fly and reverse fly exercises. To use the machine, adjust the seat and handles to your desired position. Sit down on the machine and grasp the handles with an overhand grip. Keep your back flat against the pad and your feet flat on the floor. For the pectoral fly exercise, bring the handles together in front of your chest, squeezing your chest muscles as you do so. Slowly return to the starting position, keeping your arms slightly bent. For the rear deltoid exercise, bring the handles out to the sides in a reverse fly motion, squeezing your rear deltoid muscles. Slowly return to the starting position, maintaining control throughout the movement. Perform 3-4 sets of 8-12 repetitions for each exercise, focusing on proper form and control. This machine can be a great addition to your chest and shoulder workout routine.