Jaeger Band External Rotaton

Hey I’v been using Jaeger bands for a while and feel they have been pretty good in my arm health. But my high school coach is making me only do external rotation and discredits the other stuff Jaeger believes in his routine. How can I respectfully show him evidence that the jaeger routine works. Thanks for helping out.

have him watch some videos of alan jaeger talking about his product. Or just go on amazon and show him the countless 5 star reviews, etc…

The other stuff is important, but external rotation exercises are super critical.
However, it’s odd that coach would pooh pooh the other exercises. He’s wrong.
Shoulder health and endurance require more than just the one exercise.