Aliante vs is for the bull rigid spine if you have a relatively low degree of spinal flexibility more than 90 degrees between your straight legs and 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 you will benefit from the increased curvature pelvic support of the alia