What the agonist and antagonist in chest flies?

In chest flies, the primary agonist is the pectoralis major, which is responsible for the adduction and flexion of the arm. The antagonist is primarily the latissimus dorsi and the deltoids, which work to control and stabilize the movement by opposing the actions of the pectoralis major. This balance between the agonist and antagonist helps maintain proper form and prevent injury during the exercise.