06/25/2026
"CONDUCTORS" for LOWER PEC DEVELOPMENT. Explained: The pectoral muscles primary function is to bring the arms across the body, a movement known as horizontal adduction. The chest flye isolation movement mimics this exact path of motion, keeping tension purely on the chest throughout the entire arc. In contrast, heavy pressing exercises share the workload with the triceps and front shoulders, meaning the flye more effectively recruits and isolates the pectoral muscle fibers