Lie face up on bench. Place feet flat on floor or on bench as needed to maintain lower back in a flat or neutral position (slight arch). Grip bar with hands approximately shoulder width apart. Keep arms vertical and bar just below chest with wrists straight. Squeeze together (retract) shoulder blades and maintain position throughout entire exercise. Throughout motion, upper arms stay next to the body. In a controlled motion, start lowering bar until upper arms are approximately parallel to floor. Hands must remain over elbows. While maintaining the controlled motion, push bar up to starting position without locking out elbows. Do not allow muscles to relax before next repetition.
Here are a few suggested alternative exercises:Ball Band French CurlBall Band Triceps KickBackBand KickBacksBand Overhead ExtensionBand Tricep ExtensionClose Grip Dumbbell PressDecline Dumbbell Close GripDips - MachineDumbbell Lying ExtensionTricep Extension - Hammer Strength