Which of the following includes the muscles known as S.I.T.S?

The S.I.T.S acronym refers to the group of muscles making up the rotator cuff, which includes the supraspinatus, infraspinatus, teres minor, and subscapularis. These muscles are crucial for stabilizing the shoulder joint and facilitating a range of shoulder movements. The rotator cuff is essential for activities that involve lifting the arms and overhead motions, making these muscles integral to both athletic performance and daily activities.

In contrast, the other muscle groups mentioned do not correspond to the S.I.T.S designation. The quadriceps, a major muscle group in the thigh, are primarily involved in knee extension. The hamstrings, located at the back of the thigh, play a role in knee flexion and hip extension. The abdominal muscles are important for core stability and trunk movement but are unrelated to the function and anatomy of the shoulder muscles. Understanding these distinctions helps clarify the importance of the rotator cuff in shoulder mechanics.