The man who wants bigger triceps cannot live on pressdowns alone.
Too often, we see guys in the gym—and maybe you're one of them—working their triceps to death at the cable pressdown station. Ten sets, 15 sets... whatever it takes to get them sore. But the pressdown-happy masses don't seem to realize that pressdowns only emphasize the lateral (outer) head of the triceps. So if that's all you do, you'll fail to develop the other two heads of your triceps muscles, and you'll never get the kind of growth you're hoping for.
There are other versions of this favorite you can use (plus a few exercises and techniques you're probably neglecting) that will help your cause. Here, you'll find a comprehensive plan—boiled down into five tips—that can help you build balanced, thick triceps in no time flat.