Excellent plan. Ergonomics are so important when we are sitting sewing.
I personally always have my ironing board far away from the sewing station, and I stretch as I walk to the ironing area. Another good idea is to keep your chair up high. You shouldn't have to lift your arms to sew. I have a drafting chair, because I really like to sit up high. Doing so stops that knot you get in your neck when you sew for several hours. Try a pillow on your chair and if that seems to help, try two. If I'm sitting on a normal chair (as I would at a retreat), I use a gypsy sit upon. It seems to give me some height and seems to exercise those abdominal muscles at the same time.
Everyone is different as to their needs but just keep trying things till you find what works best for your body and whatever issues it might have.
Aileen