EZ bar preacher curls do not take it easy on your biceps! It’s one of the best mass building exercises you can include in your arm workout. This variation puts all of the stress directly on the biceps and eliminates any swinging or help with momentum that you might get from a ground based movement like standing barbell curls. When you lift this curved bar using a preacher curl bench, it’s all biceps and nothing else. The EZ bar preacher curl is an exercise that is used strictly for isolating the muscles of the upper arm. This is not a compound exercise that works many muscle groups across multiple joints. This exercise strictly targets your biceps and your forearms along with improving wrist and grip strength.