While we can’t guarantee this outcome, yes people often see a reduction of stiffness and ‘unpleasant’ feelings in movements like flys, delt raises, and other problematic uses.  This is done in the 90deg hanging position where the center of mass is placed below the joint like many of our other products.  We make the assumption that you can differentiate the  ‘unpleasant’ feelings we are referencing and doesn’t mean that its ‘easy’.  Kyubells are challenging and put massive strain and load on the tissue are challenging and extremely hard in all the right ways versus the ‘unpleasant’ in all the wrong ways.