What is the teres major? The teres major is one of two muscles in the back of the shoulder responsible for slowing the arm down at the end of a pitching motion. The other muscle is the much larger ...

It also stretches the trapezius, erector spinae, and teres major muscles. Plus, it can be easily modified for different bodies and abilities.

Teres major The cable pullover works the small teres major muscle on the underside of your upper arms. The teres major helps you move your shoulders and supports your lats.