Rotator Raise

Grab two plates or two dumbbells and stand up tall with your elbows bent at 90 degrees. Keeping that 90 degree angle bring the elbows up to shoulder level. Rotate the plates or dumbbells up towards the ceiling and then rotate them back down to shoulder level. Bring the elbows back to starting position, making sure you keep them bent at a 90 degree angle.

Make sure only your arms are moving during the exercise in order to really isolate those rotator cuff muscles.