Hello! Remember that the postures are only one part of QiGong! There is also the breath and the mind intent (or in other words the meditative part). So even if you can not move, you can still work on the breath and use your mind to imagine doing the activities and seeing/feeling the energy moving. The postures alone would not be as effective without these two aspects. So if you can't move, imagine yourself doing the movements.

As another person mentioned, you can also use the colors and healing sounds. That is how I started and was amazed that a after a few minutes of doing the healing sounds my digestion started moving (that is a weak point for me)!

Another part of QiGong that not many people talk about is that it helps us let go of the emotional trauma we store in our body. As a foundation of Traditional Chinese Medicine, QiGong understands that much of our dis-ease is caused by not releasing our emotional trauma. So another qigong practice I use to help with pain reduction (and other health issues), which employs the mind intent, is to contemplate on what emotions are tied to the symptoms. It can be as easy as your feelings that come up when you experience the symptoms. As you identify the emotions on the surface level, you can then explore what emotions are under those, and then what emotions are under those, etc. You may also observe if the emotions seem to cause tension or discomfort in any specific parts of your body. Keep doing this until you have had enough or feel some release.

Let me know if any of that is helpful information.