external rotations

Ensure your elbow stays pressed against your side, and that there is no up or down movement in your forearm. And if all that is on spot, then just focus on not flexing your bicep.
 
Ensure your elbow stays pressed against your side, and that there is no up or down movement in your forearm. And if all that is on spot, then just focus on not flexing your bicep.

Agreed!

If you are lifting your elbow from your side, try placing a towel there to ensure you do not lift (or the towel will fall). Make sure the elbow is at a 90º angle and the move is coming from the rotator cuff.

If you have a free weight (very light), you could try lying on your side and doing the exercise. Again, just make sure the elbow says close to the body and is at 90º.

Good luck.
 
And keep good posture! Shoulderblades back and chest out, that helps you to "feel" the RC working (something which is kinda hard to do, even if you don't feel it working, just trust it is working)
 
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