If you have low back pain, rib flare could be a potential culprit. Rib flare refers to an abnormal rib cage positioning that has a domino effect on movement, mobility, and posture. Understanding what rib flare is and how you can address it can go a long way toward improved breathing patterns, core strength, standing posture, and more. Kayla — a doctor of physical therapy — details everything you need to know about rib flare in her latest article.