Stand up straight holding the handle of a cable, or a resistance band in your hand.
Turn your back to the attachment point and rotate your arm inwards so that your palm faces backward.
With your neck long and shoulder blades pulled gently towards each other, raise your arm directly forward.
Keep your elbow straight and your palm facing down.
Ensure you do not lean or hunch your shoulder up as you do this.
Lift your arm all the way up to the side of your head, or as far as you can manage comfortably.
Control the movement against the resistance, as you lower your arm back to your side.
Repeat this movement.