I've been working on this for about a month, 7 minutes and 30 seconds on each side. The back arm is raised just above the shoulder, and front arm at the height of face. After 4 or 5 minutes I develop incredible aching and my arms begin to shake uncontrollably. My teacher started me on this, but I haven't seen anyone else do it successfully. Actually I'm questioning if there is any real value in it except to torture myself. Has anyone ever practiced this posture in standing meditation? Did the pain ever subside? What benefit did you gain from it? I suppose any posture with the arms raised in a high position would be similar.