The cross-body stretch helps to loosen tight shoulder muscles, making it a helpful exercise during the "frozen" stage of the condition. This exercise helps to stretch the muscles under the arm ...
Those tools may be easier to grasp. This stretch is often used in rehab after surgery or for issues like a frozen shoulder, so you may not need it if you already have decent shoulder mobility.
Throughout the gradual stages of frozen shoulder, Stuek recommends moving the body and seeking physical therapy to alleviate symptoms. "One of my favorite exercises is called pendulum swings ...