The high cable curl exercise very has strict movements, and it’s difficult to cheat. You should limit the weight you are lifting, because heavier weights might tempt you in using your shoulders and chests as a support. Because of this, do heavier exercises like barbell and dumbbell curls before engaging into high curl exercise, to make the most of the overload you place on the biceps. Do the high cable curl to finish off your fatigued muscles.