Which of the following is considered a back muscle?

The Latissimus Dorsi is considered a back muscle because it is a large, flat muscle located in the lower part of the back. It is responsible for various movements of the shoulder, including extension, adduction, and internal rotation. This muscle plays a crucial role in many upper body movements and is fundamental for activities that involve pulling or lifting. In yoga, the Latissimus Dorsi is engaged in a variety of poses that require stability and strength in the back, making it a key muscle for practitioners to understand and work with in their practice.

The other muscles mentioned do not belong to the back. The Deltoid is primarily a shoulder muscle that facilitates arm movements; the Sternocleidomastoid is a neck muscle responsible for rotation and flexion of the head; and the Rectus Abdominis is a key muscle of the abdominal wall primarily involved in flexing the spine and stabilizing the pelvis. Understanding the roles and locations of these muscles is important for effective teaching and practice in yoga.