HOW: Get set-up sitting upright holding a dumbbell or other weighted object at one end in your hand by your side. Squeeze your triceps muscles to straighten your elbow and hold this position. While holding this elbow position, slowly perform concentric and eccentric wrist ulnar deviation (see video for tips).
FEEL: You should feel your tricep muscle working as well as the forearm muscles in the back of your forearm. You may feel tension on the inside of your elbow as well.