I have an asymmetrical back, it is not really visible when relaxed, but I noticed that I can easily contract and pop up my right deltoid while the left one, is impossible.
A doctor told me that after a while training I would do improvements on my left deltoid, but after two years I still cannot pop it up. Furthermore I noticed when deadlifting that my asymmetry starts being visible, since the contraction clearly shows more on my right side. However, during a dumbbell bench press or military press, I never noticed a clearly weak left side.
I always bench pressed with dumbbells, but after feeling a barbel bench press I really want to do it more often. I know that most people is not perfectly symmetrical, but I am concerned about one day having an unbalanced back when relaxed.
The question is How should I structure my workouts to ensure a proper balance? Is there anything I can do to improve my symmetry when contracted? Should I always avoid barbells?