Lying Single Arm Dumbbell Rear External Rotation What muscles do Lying Single Arm Dumbbell Rear External Rotations work? The Lying Single Arm Dumbbell Rear External Rotation is an isolation exercise that primary targets your shoulders. It’s a strength exercise that uses pull unilateral force. How to do the Lying Single Arm Dumbbell Rear External Rotation Benefits of the Lying Single Arm Dumbbell Rear External Rotation Tips for performing the Lying Single Arm Dumbbell Rear External Rotation What equipment is needed to perform Lying Single Arm Dumbbell Rear External Rotations? What type of exercise is the Lying Single Arm Dumbbell Rear External Rotation? How many reps you should do for Lying Single Arm Dumbbell Rear External Rotation?