Comment by sjtgraham

Smart people tend to overthink things, i.e. looking for exercises that isolate smaller muscles. If you have neck, back, or posture issues the chances are you will benefit greatly from just lifting weights. Before I started training I had terrible back pains and spontaneous spasms in the neck, which went away within weeks of regular training. Moreover, if I ever miss training for too long the pain returns. Focus on building up the strength to do respectable weight on the main compound lifts. Your body will thank you.