Chest flys are a popular exercise used to develop the pectoral muscles. The exercise is performed on a bench with feet flat on the ground and knees bent at a 90-degree angle. People who are just starting their fitness journey can use a lighter weight or perform the exercise with just their body weight. As you get stronger, you can add dumbbells or barbells to increase the difficulty of the chest fly. The chest fly muscles worked include the triceps, shoulders, and pectorals. Chest flyes enhance muscular endurance and can also be used for rehabilitation purposes. The exercise also strengthens the muscles around the shoulder blades and improves posture. The dumbbell chest fly is an exercise that can help to strengthen the chest and shoulders. It works the chest, shoulders, and triceps. The dumbbell chest fly can help open up your chest muscles, reduce upper back pain, increase range of motion, and reduce tightness in the upper body. Chest flies are a great exercise for developing the chest muscles, increasing muscle tone, building muscle mass, and increasing strength. They can also be used to improve your posture. Chest flys work the pectoralis major, which is the muscle that makes up most of the chest. The fly machine is ideal for increasing chest strength and muscle mass by targeting the pectoralis muscles.