Episode 78: “Standing External Rotation - Series (4/10)" Gravity goes DOWN! Not sideways! Shoulder external rotation exercises are a great way to target the #rotatorcuff. However, these exercises must be done against resistance in the appropriate plane. In this example, the force of the dumbbell is directed DOWN. So, which muscles am I actually using to resist this force? My biceps! Not my rotator cuff! Yes, we are in fact targeting the rotator cuff musculature working horizontally against gravi