Originally Posted by
SivariKing
From my own experience. After years of doing almost exclusively low-bar squats, bench, deadlift, chins and presses, my upper traps and anterior delts got strong, but I had no posterior delts or mid traps. Pressing didn't fix this. I needed to work those muscles directly with rows and rear delt focused movements. This is simply what I ended up with after neglecting smaller muscle groups while training. Other people will have different muscle imbalances ( or lack thereof ), depending on their body-type, training history, previous injuries, current training focus, etc.