POSTURE CORRECTOR. Do you suffer from hunchback, neck or back pain caused by sitting in front of a computer for long periods of time? Use the yoga posture stick as a back, neck, hunchback posture corrector and shoulder exercise. As a back cracker will improve posture and balance by providing stability and support to improve your overall alignment. This tool is designed to help you correct your posture and relieve your pain in the most comfortable way. COMFORTABLE DESIGN. Retractable and adjustable with one-click, one-rotate with a 90-degree swivel design allows you to lock in place and easily adjust length by pulling ends.