The standard barbell is the one that most people are aware of, but there are others. The EZ-curl bar helps you train the biceps and triceps with a more natural grip that is easier on the wrists and elbows. A multi-grip barbell has different neutral grips to help you train the upper body in different ways. A trap bar is in the shape of a hexagon or octagon. You can stand in the middle and lift it with the handles on the sides. This is primarily used for lower-body training, but you can perform some upper-body movements, as well.