Brian says he likes to use the pec fly for a great warm- up or burn out for any chest workout. "It offers a great stretch and hold contraction on the chest".
What Muscles Does the Pec Fly Machine Work?
The machine emphasizes your pectoralis major muscle, the broad muscle of the chest, as well as a few helper muscles. It has minimal reach when it comes to muscle activation, though, as it's an isolatio
n exercise, activating just one joint.