Using a pulley system with relatively light weight, the athlete locks the elbow of their pulling arm at the same hip and externally rotates the pulley away from the body. It is important to try and keep that elbow as close to the body as possible throughout the movement to maintain focus on the Teres Minor. We'd often place it at the beginning of a lifting program, especially for baseball players and athletes with shoulder issues, and keep the rep range from 8-12 reps with a tempo of 1 second out (away from the body) and 3-4 seconds back to the body. As with all lifts, tempo and grip and repetitions can be varied depending upon purpose, timing, experience, variability, etc.
In the video we have John Mariotti demostrating the exercise. At the time, John was training with us in preparation for his representing Italy in the 2013 World Baseball Classic.