A lot of it has to do with muscle insertion points too bro. If you look at Arnold, Flex Wheeler, or Brian Dawkins of the NFL if u know who he is, sh** actually most pro bodybuilders, their triceps insert all the way down into the elbow. If you have a higher insertion point and long tendons, it'll be difficult because the actual belly of the muscle is relatively much shorter and you'll have a rough time gettin em huge. We all have our freaky bodyparts that grow like a weed no matter what you do, and our bodyparts that lag behind no matter what...all strengths and weaknesses are due in large part to bone structure and musc. insertion points... that said of course we can all back off on our strongest sh** and work the hell out of our weak points... my point is just know that maybe you gotta accept that your tris will never be your showcase bodypart, but never blame genetics, ever, just work your balls off with all that good advice all these dudes gave u above. PS Familiar with Franco Columbu? His insertion points sucked on his arms, it was damn near impossible for him to catch his arms up to his ridiculous torso n legs but he proved for those of us who got the sh** end of the stick on that, that you can still get strong as a bull, get "big arms" as compared to the rest of humanity and get a sick ass biceps peak ... oh yea and he won the Mr. Olympia twice. Train on bro