Traps (short for Trapezius) give you that american football player look. There is nothing more pathetic than a thick muscular chest and a pencil neck on top of it where volcanic traps should be.  Many make this mistake in the beginning of their training and find themselves trying to make-up for missed time later on. Unlike lats, which can only be trained by pulling exercises, traps can also be trained by pushing exercises. If you do two or more exercises for traps in your work out, it might be a good idea to include both for fuller development.