Movement: With your arms extended and hands grasping the band, pull the band apart and retract your shoulder blades. Next raise your upper arms until they are parallel to the floor, and from here rotate your forearms so your fists are in a line with your head. Finally, move your hands and the band forward in front of your head until full extension. Return to the start position working backwards through those same steps.
Emphasis: Focus on your shoulder blades throughout the movement.