Stand or sit. Position bent arm up to side; elbow bent shoulder height with wrist above elbow.
Pull wrist back as far as possible while keeping elbow directly lateral to shoulder. Repeat with opposite arm.
Wrist should be able to travel slightly behind frontal plane of shoulder. The distance wrist travels behind shoulder or range of motion is noted in each side.
Keep elbow squarely lateral to shoulder for consistent assessment protocol. A mirror may help monitor proper form and assist in a more accurate assessment. Note any pain or discomfort during movement. See Shoulder External Rotation Inflexibility.