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The Muscles Used in a butterfly press machine
The peck deck, a weight machine, consists of a platform upon which you sit. Protruding from a bar behind the seat are two levers that you pull toward each other. When you do, you'll feel your upper body muscles squeeze together, eliciting action in the pectoralis major.
butterfly machine workout benefits
Because only one joint is used in the pec deck action, it's considered an isolation exercise. No real stabilizing muscles are activated; the machine acts as a stabilizer.
Pectoralis Major: The pectoralis major attaches at the clavicle -- up near the collarbones -- and at the sternum, the bottom of the breastbone. In women, this muscle lies mostly underneath the fatty breast tissue. The pec deck flies primarily targets the sternal, or lower, a region of the muscle, but the upper portion of the muscle does assist in the action.
Pectoralis Minor: This is a thinner, flatter muscle that lies underneath the pec major. It provides assistance to your pec major during the pec deck flye by keeping your shoulders from shrugging upward.
Serratus Anterior: Your serratus anterior lies along the sides of your chest wall, right above the first eight ribs. A strong serratus anterior provides power to punching and swinging actions.