Which muscle is NOT one of the "SITS" muscles in the rotator cuff?

The deltoid muscle is not one of the "SITS" muscles that comprise the rotator cuff. The "SITS" acronym refers to the four key muscles involved in stabilizing the shoulder joint: supraspinatus, infraspinatus, teres minor, and subscapularis. These muscles play a crucial role in shoulder mobility and stability by holding the head of the humerus firmly within the shallow socket of the shoulder blade.

The deltoid, while an important muscle for shoulder movement, especially for raising the arm, functions primarily to cover the shoulder and provide strength to various shoulder motions rather than contributing to the stabilization of the shoulder in the same way the SITS muscles do. Understanding the distinct roles of these muscles is essential for properly addressing shoulder health and rehabilitation in senior fitness.