Best upper body workout (abs, pecs, arms) for someone with a bad back...?

might be an obvious answer, but maybe find lifts that you can do that don't hurt your back. experiment with incline, decline, and flat benches, erfly lifts, leg lifts, curl while sitting, wall sits, anything that you can do that doesn't hurt. also maybe try wearing a back supporting belt or some kind of brace. i have spinal scoliosis and it causes a problem when i lift sometimes, not pretending like my pain is anywhere near as bad as yours, but i mean sometimes it messes with my routine and i just gotta skip a few lifts.