Is an exercise ball actually good as an office chair?

This is the most contested claim in the signals. Some specialist fitness community threads argue the posture and core benefits are minimal and that you can still slouch on a ball, while back-pain community posts report it encourages more movement and less stiffness. The trust-weighted takeaway: a ball chair can help you fidget and shift more, but reviewers caution it is not a proven posture cure and is best used part of the day.