Sit in machine with chest against pad. Grasp parallel handles from inside with thumbs down at shoulder height.
Keeping elbows pointed high, pull handles apart and to rear until elbows are just behind back. Return and repeat.
Pronated grip will internally rotate shoulders so elbows are kept at height of shoulders. Preventing elbows from dropping below shoulders will minimize Latissimus Dorsi involvement. With thumbs down grip, shoulder must be deliberately internally rotated to keep elbow at proper height. Some machines allow for a more neutral overhand grip.