Mastering Your Bicep Curls : Perfecting your form to get a full range of motion and avoiding the swing of the Bar. Stand holding an EZ-curl bar using a shoulder-width supinated grip (palms facing upward). Your elbows should be almost fully extended, and the bar should be resting against your thighs to get full range of motion. Keep your elbows by your sides. Only your forearms should move. Keep your body still. Do not sway your body or swing the EZ-curl bar with momentum to get the most out of t