An EZ bar's curved grip puts your wrists in a more natural, slightly angled position than a straight barbell, which is why it's the standard tool for biceps and triceps isolation work, curls and skull crushers especially, in almost every gym. That curve reduces wrist and elbow strain that a straight bar can cause on these movements, particularly for lifters who already deal with any wrist or elbow discomfort during arm training. It suits anyone doing regular direct arm work; the reduced joint strain makes it close to a strict upgrade over a straight barbell for curls and extensions specifically, even though a straight bar still has its place elsewhere. The bend also lets you choose a grip width and hand angle along the curve that feels most comfortable for your particular joints, which a straight bar doesn't offer at all. Program EZ bar work in the 8 to 12 rep range typical of arm isolation training, and treat grip position as something worth experimenting with rather than defaulting to the same spot every session. The most common mistake is using a grip that's too narrow, which increases wrist strain rather than reducing it, working against the entire point of the curved bar. A second is treating the EZ bar as only for biceps curls when it's just as useful, and just as joint-friendly, for triceps work like skull crushers and close-grip extensions.