Your triceps comprise of more than two-thirds of your upper-arm mass. Building thicker, more developed tricep muscles makes your entire arm look gun-worthy rather than pistol-friendly. But horseshoe triceps aren’t just for show, they also play a significant role in some of the most effective and popular exercises, like the press-up and bench press. In fact, tricep strength (or lack of), is usually the limiting factor in many pressing movements. ~ Berceste