Here is an image for you to try. Instructions are below:

Examine the illustration here. The person on the right is sitting forward on a chair. Follow this example by sitting yourself forward and up in a chair… far enough forward so that a slope in the seat does not make it hard for you to sit up like the person in the drawing. Uncross your legs an rest your hands on your legs. If sitting up like indicated is very uncomfortable for you, just do the best you can.
Next, imagine that you are, in fact, not a person sitting in a chair but, rather, a lamb-like creature balanced on a chair, with its chin, limbs, and tail wrapped around a dark, cool, slightly heavy egg. This egg is something the creature wishes to protect. (This all may sound ridiculous, but you are this far along so don’t turn back.)
You are to imagine, but in no sense imitate, that, as this creature, you have very very light and fluffy fur (If you wish, you can imagine light balls of cotton instead, if that gives you a greater sense of a light and fluffy). This light fluffy fur extends all over your back but just as importantly includes your tail (which is long and wide), back of neck, back of ears, head, upper eye lids, and nose.
All the features of your face are very relaxed, just as shown in the drawing. Imagine holding the cool, dark egg as closely as you can, making body contact with it as much as possible as the drawing indicates. You are attempting to cover it as much as possible, with your chin, neck, arms, chest, stomach, legs, groin, under side of tail. Take some time with the image. Finally, imagine that you, wrapped around the egg, rock backward a little bit and then imagine rocking considerably forward. At this point, you can allow yourself to actually rock forward enough to be effortlessly over your feet…and then stand up. Even in the standing position, you can imagine yourself surrounding the egg as you were before. Miraculously you will be standing though your legs are still wrapped around the egg!
You should experience an easy trip to standing position, without the usual effort. You can get better and better and experience its beneficial effects more and more, with repeated experiments with this image. Remember, just imagine, and do not consciously physically imitate the illustration or directions. It is also important to endeavor to experience the qualities suggested all over your body, leaving no surface unconsidered. Do not be surprised if small changes take place that do not seem to be right for the illustration. The goal is to release body parts to their most relaxed and yet structurally sturdy positions… not to learn how to hug an egg.
The purpose of this image is to promote appropriate or ideal postural sensations, which are 1. a sense of expansion on your dorsal surface (the fluffy side) and 2. a sense of contraction on the ventral side (the side in contact with the egg). If you have what feels like success and experience some interesting changes, I would love for you to let me know. If you have troubles with the image, I would like to help. So feel free to post a comment or two.
Cheers, John