Dennis,
I have two slipped discs that I am working diligently to adjust so I am often in a lot of pain when I stand for very long. While you did not describe which of the exercises cause you pain or what type of pain, I can share that I do most of my exercises laying down flat on my back and I do what I physically can.
Depending on the day I also do the "sitting" meditations laying down.
As you read all the posts you will see lots of different ailments that have been helped by practising SFQ and how many of us just start slow and build.
Best to you
Deb