
stand facing wall with arms elevated to 90 degrees, alternately shift weight between hands while holding pillow against wall
Stand facing the wall, elevate the arms straight forward to 90 degrees and hold the pillow resting on wall. Shift the weight on one hand by lifting the other hand off the wall. Hold and shift weight on other hand. Repeat Alternate.
Nothing here is a prescription. Your physiotherapist decides which of these are yours, and when.