Muscle and Motion on Instagram: "Pec Deck Fly: Watch Your Chest Muscles in Motion! 🔥 Our state-of-the-art animation takes the pec deck fly to the next level, showing you exactly how your pectoralis major works during every rep. This visual breakdown gives you a deeper understanding of the biomechanics behind this powerful chest exercise. 🚀 Dive into biomechanics and learn how to train smarter with the Muscle and Motion Strength Training App—link in bio! #muscleandmotion #pectoralismajor #chest