Rear delts are one of the most under worked muscles for all strength athletes and lifters. Because of this imbalances can be developed setting the stage for shoulder and pec injuries.
This is a great movement with the total focus being on the rear delts and traps. Begin with a pre-stretch in the upper back, rear delts and traps. As you pull the handles back also make sure to pull slightly upward. This will work the traps harder than your standard rear delt raise.
This is a high rep movement (12-15) for multiple sets (3-5).