I have lower back problems and sitting too long gets very painful, last year we purchased one of those electric adjustable height desks for me to sew on. It's wonderful! I stand to do 90% my sewing and quilting now which is much much easier on my back and if I need to sit I just push a button to lower it and grab my chair. I got one of those thick foam floor mats to stand on and I got a desktop that is 30x72 so I have more room for my quilts to puddle. Talk to your doctor or PT for recommendations about altering your ergonomics.