The movement and positioning described in your steps primarily stretch the shoulders, chest, and upper back. More specifically, this stretch can help target the following areas:
- Pectoral muscles (chest muscles): Stretching occurs as you pull your arms back and rotate your palms.
- Deltoids (shoulder muscles): The rotation and extension can create a stretch in the shoulder area.
- Rhomboids and trapezius (upper back muscles): These muscles may also be engaged and stretched as you pull your shoulder blades together.
Overall, this exercise is beneficial for improving flexibility and posture in the upper body.