Originally Posted by BendtheBar
I don't think they are the most effective trap builders, but I think they can be a good trap builder. To me the most potent trap builders are deadlifts, explosive Olympic variations, power shrugs and to a degree overhead presses.
Deads and cleans. For a long time, when I started lifting, I tried shrugging, but was not using deads and cleans. Couldn't see much trap development. Once I added in the deads and cleans (and actually stopped shrugging, although this was more to do with limited time in gym than any pet peeve against this lift), traps responded beautifully.