Thanks Cranberry ... that link gives a lot of good stretches that pretty much sum up the ones that come to my mind to help quilters stretch it out. And then some!
NoraB ... stretching is important, even if you have not been doing them, you can always start. Just don't overdo things, and work towards improvements. Once you feel the stretch, hold it for a few seconds .... and don't push beyond. If it hurts .... stop! If you do the stretches regularly, you will notice the improvements.
Some other things to consider are the ergonomics (not just your ironing station) for your whole sewing room. Also, to add in the anti-stress mats wherever you are standing (long arm, ironing, etc.). Plus the footwear you have on can make a big difference to your overall body-health.