First I agree, sewing can be painful to some of us. I sew only so long at a time. I do break often for exercise.
And ... most important ... I have arranged my sewing area ergonomically. I don't use a chaqr but a Swopper, which sorta looks like an adjustable mushroom.
My ironing board is in the other room so I do get up when I need to iron.
Massage &/or a chiropractor is great if you can afford them.
For me ... I adapted.
ali