To perform the Isometric shoulder elevation exercise in sitting position :
Muscles involved are levator scapulae, the upper fibers of the trapezius.
Alternatively this exercise can be done in standing position as shown in the video.
This large, flat muscle, which looks like a pointed cape over the top half of the back, assists in moving the head backward.
It helps in rotating the scapula as well as in drawing it toward the spine. The lower part of the muscle assists in drawing the scapula downward and in drawing the arm
inward. It arises from the back of the skull along a part of the superior nuchal line on the occipital bone, from the spinous process of the 7th cervical vertebra, and from the spinous processes of all the thoracic vertebrae. It drapes over the shoulder to insert on the clavicle and along the superior border of the spine of the scapula.
It arises as small tendons from the transverse processes of the atlas and axis as well as from the next two vertebrae. It inserts on the top part of the medial border of the scapula.
It elevates the superior angle of the scapula. If unchecked, it does lateral rotation of the scapula. With the cervical vertebral column stable, it acts together with trapezius to elevate the scapula or to sustain a weight carried on the shoulder; with the shoulder fixed, the it bends the neck to the same side.