Movement: Stand next to a fixed object with band fixed or looped securely around it at waist height. Grasp the band across the body using the arm opposite the apparatus. Fix the elbow of the working arm into the side of the body, and rotate the forearm away from the apparatus and the body.
Repetitions: Perform all prescribed reps on one side, then on the other. This counts as one set.
Muscle Roles in external rotations - standing, resistance bands