i love the stiff leg dead lift for the back might not make you look bigger but when you picking something up i believe it helps. also supermans i find are great exersise for when you dont have weights.
the lats pull ups are the best weights lat pull down and pull over also works the chest.
remember work your lower back not just the upper. i believe the lowerback very often over looked.
“Invincibility lies in the defence; the possibility of victory in the Attack.” - Sun Tzu