HOW: Begin with a resistance band in both hands up towards your chest. Pull the resistance band on one end with your triceps. While the band is tensioned, allow your bent arm to slowly meet the other arm towards your waist. Once tension in the resistance band is lost raise both arms and repeat.
FEEL: You will feel the biceps working on the arm that is lowering. You will feel the triceps working on the arm that is straightening out initially.
COMPENSATION: Avoid allowing the shoulder to round forward while performing this. Keep your shoulder blades strong for the entirety of this exercise.