Learn how to do Pec Deck Flys with proper form and tips, and discover the benefits and alternatives of this chest isolation exercise. Pec Deck Flys target the pectoral muscles, engage the anterior deltoids and triceps, and can be used as a warm-up or finisher. Chest Pec Deck Overview The Pec Deck is a machine exercise designed to target the chest muscles, particularly the pectoralis major. The movement mimics the action of a chest fly , isolating the chest muscles and helping to improve strength and muscle definition in the upper body. Transform your Upper back with the Reverse Pec Deck Fly ! Target your Posterior Deltoids, Rhomboids, Trapezius, Infraspinatus, and Teres Minor. Learn proper form and tips for success! The pec deck fly offers isolation and muscle definition, while the chest fly promotes functional strength and athletic performance. By understanding the differences and benefits of each exercise, you can tailor your training program to meet your specific fitness goals.