Stand on your resistance band, feet are about hip width apart. Bend your knees slightly. Cross the resistance band and grab it with your hands. I would advise to hold it quite tightly as the movement might be too easy otherwise. Move your shoulders back and down and create tension. Move your straight back into an upright position and shift your hips slightly foward at the end point. Even though your knees can bend and straighten a little bit, the movement should be done from your hips and not from your legs.
Bring your resistance band under tension behind your shoulders. Arms are stretched to the sides. Bring your straight arms together in front of your chest.