What is the focus of the supine arm series up/down circles exercise?

The supine arm series up/down circles exercise primarily targets the latissimus dorsi, which is one of the major muscles of the back. When performing this exercise, the emphasis is on the controlled movement of the arms in a circular motion, which helps in engaging and strengthening the latissimus dorsi as well as promoting mobility in the shoulder joints. This exercise requires stabilization of the trunk while the arms move, ensuring the activation of the lats as they function to assist with the movements of the arms.

By focusing on the latissimus dorsi, this exercise not only promotes strength but also enhances coordination between the upper body and core, which is essential in many Pilates routines. Other muscle groups, such as the core muscles and lower back, may also play a role in stabilization and support during the exercise, but the primary focus is on the latissimus dorsi through the specific arm movements involved in the series.