Your triceps generally originate from the rear deltoid region so to actually get full development of your tri's, you should include some form of pullover as your triceps assist in that movement. I great exercise is a combo pullover/close grip bench. Just do a bent arm pullover and when the bar comes back over your chest, press it up with elbows tucked in to sides. That's one rep. This way your are working the tri's thru their full function (shoulder joint and elbow joint). It's a good variation to Skulls.