To increase full cervical spine extension, in a unloaded position. This is good for people who have disc bulges and pain when tilting the head back in sitting, and those who suffer from poor posture and a dysfunction in the lower cervical spine. This exercise encourages extension (backwards bend) through the lower part of your neck which is often stiff and usually held in a flexed (forward bent) position. It also encourages flexion through the upper part of your neck which is usually in extension when we sit with our chins poking out.