i assume by "traps" we're talking about Trap I & Trap II. There are 4 Trapezius muscles (I, II, III, and IV). Trap III (i.e. the "mid Trap") performs retraction (pinching back) of the shoulder blades, along with the Rhomboids whenever you do high rows or wutever. The Lower Trap (Trap IV) does scapular depression ( along with the pec minor) like at the top of a Dip. Trap I & II (the ones probly being discussed here) do wut they do (scapular elevation) along with the Levator Scapular muscle. Point is...they do what they do

like all muscles, so theres only one way to work em, and thats to...well, do wut they do, haha. If u wanna work ur upper Traps, you gotta elevate ur scapulae (shoulder blades) against resistance...nuthin else can be done. The reason u might "feel it" when u do deadlifts is just b/c u are tensing/tightening them to support/hold the weight ur holding onto. But thats an isometric contraction (thus wont "develop" them). Itll hurt/fatigue/etc but not develop/build. To build, u gotta contract thru an ROM so the sarcomeric fibers are strained/damaged. We wouldnt "hold a dumbell at a 90-degree angle" and say we'r working our biceps, right? We'd "feel it," but it wouldnt be developmental.
So wuts the answer? bstacked actually made the key point when he said that "some ppl just get size better in some areas." Same reason myself (and others) can work our calves until our pecker explodes but they just wont grow (the calves, i mean

. All u can do for ur upper traps is shrugs, bro (or some variation) using a different form of resistance (e.g. cable, band, 5-gallon bucket...dsnt matter). the upper traps are connected in a way that elevate the shoulder girdle...so no other mvmnt will be using those muscles. that mvnt occurs at the "end" of an ovrhead press, an upright row, and maybe a lateral raise, but the mvnt is scapular elevation....all u can do bro.
sry...my calves feel ur pain
