How to do it: Wrap a resistance band around a low, sturdy object in front of you, such as a post or pole. Sit on a towel with your legs crossed, and grasp the handles of the band in each hand at shoulder level with your arms extended (there should be some tension on the band to start) [A]. Using a controlled motion, pull your elbows back until they are level with your torso, squeezing your shoulder blades together and keeping your upper arms tight to your sides [B]. Return to starting position and repeat.
Tip: Keep your back tall and straight - do not sway from side to side. Keep your core contracted throughout the move.