How to avoid building trapezius (mid-shoulder) muscle?

[8787cj]

How can I still lift for my back, chest, and arms, whilst not building the trapezius muscle? I want to avoid the rounder triangle look like the photo below, and aim for a more square-like straighter look. What are some things I should definately avoid?

I want to do everything to make my shoulders broader (left to right), and any vertical height makes them look rounder.

 

[SpyWizard]

easy, i train to not build my traps.. they are naturally too big..

do not add shrugs, standing flys, deads..

pull overs yes
pull downs yes
seated military press yes
just nothing in the plane low to high..

works for me..