This exercise uses an incline bench and twist to more to change your bodys position as you perform bicep curls. The movement is very similar to a Preacher Curl.
Steps
Adjust and incline bench to a 45 degree angle.
Grasp dumbbells in each hand with and sit down with your back against the bench, with your feet resting on the floor for support.
Allow your arms to hang down at your sides, your palms facing your body.
Keeping your elbow straight, raise the dumbbells up towards your head, contracting your biceps.
In a controlled manner lower the weight and repeat.
Tips
Practice steady movements in this exercise, be careful not to let your arms sway.