DB Delt Fly
Using a Lower Back Extension bench(shown) or a incline bench, lock lower back and roll shoulder blades(Scapula) back. Use lightweight and stretch arms out into reverse fly position. Keeping tension on traps and rear delts, repeat motion.
Repetition Guide
Strength: 3-5 Reps X 4 Sets (Heavy Weights)
Size: 12 Reps X 5 Sets (Medium Weights)
Tone: 20 Reps X 3 Sets (Light Weights)