Sit on a flat bench holding a curl bar with an overhand grip. Lie back so that the top of your head is even with the end of the weight bench. As you are lying back, extend your arms over your head so that the bar is directly over your eyes. Keep your elbows tight and your upper arms stationary throughout the exercise.
The biggest key to this exercise is keeping your upper arms in a fixed position. Slowly lower the bar until it almost touches your forehead. Press the bar back up in a slow, sweeping arc-like motion. At the finish, lock your elbows completely.
