What muscle group is primarily focused on in the 'Back Support' exercise?

In the 'Back Support' exercise, the primary focus is on the shoulder extensors. This exercise emphasizes the engagement and strengthening of the muscles that help extend the shoulders, which include the latissimus dorsi and teres major. These muscles play a crucial role in maintaining proper posture and providing stability while the torso is lifted and supported by the arms.

While other muscle groups, such as the hip flexors, abdominals, and obliques, may also be engaged to some extent for stabilization and support, the main intention of the 'Back Support' is to work on the strength and control of the shoulder extensors. This is essential for facilitating correct form and ensuring safety during movement, as well as for enhancing upper body strength necessary for various other exercises in the Pilates repertoire.