2 questions

[Drifter]

Here is the cuban rotation (which I highly reccomend) along with a couple of other exercises....

http://www.testosterone.net/html/body_145shldr.html

 

[casualbb]

Wouldn't it be the subscapularis? That looks like the arm-wrestling movement...

http://www.exrx.net/WeightExercises/Subscapularis/CBInternalRotation.html

-casualbb