I have a bad back and I have to get up frequently. I keep my iron and ironing board across the room so I have to get up to press. I use a deeper cushion on my chair, I have a heating pad I use a lot of the time. Posture is really really important to, relax the shoulders, sit as straight as you can and keep both feet level as you can.
Hope this helps, I've had to learn to lie down and hand quilt during the worst days. But it doesn't hurt the enjoyment.
Hugs,
Sharon