Rotator cuff tendinopathy/tendinosis is degeneration and/or disorganization of rotator cuff tendon tissues (generally due to overuse and repetitive action). You would like to warm up the muscles and joints so utilizing the Arm-Across-Upper body extend is a great way to loosen up your upper arm. Although doing the exercise be sure https://www.theorthopaedicandpainpractice.com/what-are-some-shoulder-pain-treatments/