Most people do shrugs standing or sitting, but always upright. A kelso shrug is really any shrug that's performed on another plane, other than upright. The example I had in mind is one you can do on a chest supported T-bar row or inclined bench. Arioch turned me on to these, and I really like where they hit. You just lay face down on the incline bench or chest support, and rather than rowing, you shrug at that angle. You can also sit back at a 135 degree angle on a cable row, and shrug a narrow or wide bar (I hook the lat pull down bar up to the cable). You can also lay completely back and shrug. These are great, but I'm just a girl and I can do the stack, so it may not be enough weight for you.