Stand with low double pulleys behind. Grasp stirrup attachments, one in each hand. Stand away from pulley slightly with arms back somewhat at side and elbows straight or slightly bent.
Raise one stirrup forward and upward until upper arm is well above horizontal. Lower and repeat with opposite arm, alternating between arms.
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.