Stand about hip width apart. If you tend to overstretch your joints like me, keep a micro bend in your knees. Bend your elbows 90 degrees, elbows are close to your rib cage. Grab the resistance band, fists, facing upwards. Move your forearms to the side for 90 degrees, move back. Limit this movement to the forearms, the other part of your arms remain in their initial position.
Exercises
Butterfly with Thera Band
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.