The sternocostal head of the pectoralis major is stretched with horizontal extension of the arm at the shoulder (glenohumeral) joint.
Note: This stretching protocol will also stretch the anterior deltoid.
![The sternocostal head of the pectoralis major is stretched with horizontal extension of the arm at the shoulder (glenohumeral) joint.](https://learnmuscles.com/wp-content/uploads/2017/10/Anterior-deltoid-and-Pect-major-sternocostal-head-stretch-531x1024.jpg)
The sternocostal head of the pectoralis major is stretched with horizontal extension of the arm at the shoulder (glenohumeral) joint.