Always follow your medical doctor's orders first and foremost for any mind or body practice. If there is no medical reason to worry, I would like you to know that I created these tracks to be as gentle as possible. Nothing is forced on you, and all of the suggestions are optional in the tracks.
One thing I always recommend my clients do when testing out a new mindfulness track is to listen to it in a non-meditative state FIRST, to check that it is appropriate and to check that it doesn't trigger something very tender in their fresh experience. You can do this with the tracks. Listen one time over FIRST, then listen again, in a meditative state.
All of the practices can be used in motion, so if you are worried that sitting still could be too much for you, use the tracks while walking or exercising (just not while driving!)