What is the intention of the Swan Dive Prep in terms of muscle control?

The Swan Dive Prep primarily focuses on building back extensor strength. This exercise emphasizes the engagement and control of the muscles along the spine, specifically targeting the erector spinae and other muscle groups that help with back extension. By concentrating on this strength, practitioners develop the ability to maintain a stable and controlled position while promoting a strong and flexible back. This is essential for more advanced movements in Pilates, where a strong back allows for greater stability and overall body alignment during various exercises.

While the other options may involve elements of muscle control, they do not encapsulate the primary intention of the Swan Dive Prep. Arm coordination, lower back flexibility, and trunk rotation are important in their own right but are not the main focus or primary benefit of this specific exercise. Therefore, building back extensor strength correctly identifies the intention of the Swan Dive Prep, leading to improved movement quality and muscular balance in the body.