Grasp stirrup attachment. Stand away from pulley slightly with arm back somewhat at side and elbow straight or slightly bent.
Raise stirrup forward and upward until upper arm is well above horizontal. Lower and repeat. Repeat with opposite arm.
Absolute height of movement may depend on range of motion or when stirrup or cable makes contact with underside of forearm. Raise should be limited to height achieved just before tightness is felt in shoulder capsule. Alternatively, height just above horizontal may be considered adequate. Elbows may be kept straight or slightly bent throughout movement.