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 stirrups forward and upward until upper arms are well above horizontal. Lower and repeat.
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.