The double cable row works wonders if you are trying to add density to your upper body. Pulling a cable in each arms changes the fulcrum of the seated row, which will hit the lats from a new angle, increasing the potential of unlocking new muscle fibres.
Main Muscles: Latissimus Dorsi, Rear Deltoids, Biceps
Keep your back straight & core tight
Bench should be on an approximate 55 degree incline