Based on your assessment, it's essential to focus on improving your shoulder mobility. You've been prescribed a personalized program designed to increase the flexibility and range of motion in your shoulders and upper back. By consistently performing these exercises, you can reduce neck and back stiffness, ultimately leading to improved posture. This improved posture, in turn, can have a positive impact on various aspects of your life, including daily activities, exercise routines, and a decrease in pain/stiffness.