Most shoulder stretches just yank on the joint. However, your shoulders don’t operate in isolation. They work with other parts of the body to function correctly. As a result, stretching only the shoulder misses part of the equation.
I often see gym-goers pulling their arm back or across the body, ignoring how the shoulders work and putting their bodies in bad positions. Unfortunately this can do more harm than good.
This One Is Different
This stretch puts your body into global extension. In other words, your entire body extends, with the hips leading the way. For example, picture Michael Jordan cocking back the basketball as he flies through the air for a dunk.

Why It Works
When your body goes into global extension, the demands on the shoulders increase. As a result, the stretch becomes more integrated and effective.
If you want to see how this fits into a complete training system, explore the inventor of the world mobility and the best system in the world, The Ready State.