Aliante Carbon K:ium is for The Bull: Rigid Spine If you have a relatively low degree of spinal flexibility (more than 90 degrees between your straight legs & back when bending over as far as you can, keeping your legs straight a shoulders’ width apart), you are a Bull. Your degree of Spinal flexibility will top out quite quickly when attempting to adopt the performance position. For this reason you will rotate you pelvis fully & will benefit from the increased curvature (support) of the Aliante shape.