Shoulder W exercise - best bang for buck rotator cuff band exericse

This is the best shoulder external rotation exercise for the rotator cuff. The reason for this is that it activates the external rotators of the shoulder (infraspinatus, rear delts, teres minor) as well as the retractors (mid trapezius, rhomboids) and the lower fibres of the serratus anterior that help to hold the scapula on the the ribs which is great if you have winging and unstable shoulders.
It's call the "W" as your body should look like a W from arm to arm.

Instructions:
Stand with feet shoulder width apart. Take band shoulder width apart and grip the band with a fist, palm side face each other. have elbows slightly away from the body.

Externally rotate the shoulders so that the arms and body make a W shape at the end of the exercise. Perform slowly and with control, 3seconds back, 3 seconds forward.

Feel the contraction in the back of the shoulder blade, squeeze the shoulder blades together at the back and also tuck the shoulder blade under as though the shoulder blades are hugging onto the ribs.

Keep the core activated by keeping the chest down and the pelvis slightly tucked under. Don't over extend the spine and flare out the ribs.