Hi, you should also look at how long you sew at one time. I make sure my ironing board is in a different room and my cutting/assembly table is in a 3rd room. That way when piecing a quilt I'm getting up and moving around every 5 minutes or so. Some people would consider this inefficient, but I think the few extra minutes it costs in an hour are worth it to stop my muscles from tensing up and my whole body from stiffening by being in the one position for too long -- and we can all use a little more exercise!