Sit on seat above twin cable pulleys. Grasp stirrups on each side. Sit upright with arms straight down to each side with palms facing back.
Raise one stirrup forward and upward until upper arm is well above horizontal. Lower and repeat with opposite arm. Continue by alternating raises between sides.
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.