Pec Dec Fly

The pec dec fly, also commonly known as the butterfly is designed to work on the pectoralis major and minor or in simpler words, the chest muscles. It has weights that are controlled by leverage. It helps in expanding the chest, as the arms move in and out like the wings sof a butterfly.A machine fly, alternatively called a seated lever fly or "Pec Deck" fly is a strength training exercise based on the free weight chest fly.The pec deck machine, or machine fly, as it is more commonly known, is a gym apparatus that is made specifically to isolate the chest muscles, or pectoral muscles from which the name “pec deck” is derived, during exercise, thus allowing one to really develop those muscles in particular.The dumbbell chest fly can help open up your chest muscles. Chest openers may help reduce upper back pain, increase range of motion, and reduce tightness in the upper body. If you're doing dumbbell chest flies as a way to open up your chest muscles, consider using lighter weights, or even no weights.As previously mentioned, the chest fly will largely call on your pectoral muscles, as well as your anterior deltoids. But your latissimus dorsi (which helps you extend and rotate your shoulders and arms) also help you complete the movement, says Wang.