Search the forum for a post with a link to Ball State University. They had video clips of the proper way to do damn near any exersize you could think of.
There have been a couple of articles for hepling a hunchback. The most recent (that I remember) had to do with pelvic tilt and strengthening the hip abductors and adductors. A search should bring it up. Be as specific as possible in your search and you will get fewer matches.