Tempo (3-1-1-1): Lower the dumbbells under total control for 3 seconds, feeling a deep stretch across the sternum. Pause for 1 second at the bottom without resting the weight on your chest. Drive upward explosively for 1 second, converging the dumbbells inward, and flex hard at the peak for 1 second.
Rest: 90 seconds between defining sets.
"Delavier Note: Dumbbell presses on a flat bench allow independent arm convergence, maximizing inner pectoral separation and activation."