A reader of KNDD (this site's mouthful of a name really cries out for a handy abbreviation, so when another reader used this one on the site's Facebook page last month I decided to go with it) recently emailed me commenting that I tend to advise readers to "fix dropped shoulders" in my reviews and asking if I could point her to some instructions on how to do that. I couldn't find any such tutorial in a very quick Google search, and it occurred to me that since I am so given to blithely…