Gobi XM is for The Chameleon: Medium Spine If you have an intermediate degree of spinal flexibility (approximately 90 degrees between your straight legs & your back when bending over as far as you can, keeping your legs straight a shoulders’ width apart), you are a chameleon. Your degree of spinal flexibility helps you so far, before you need to rotate your pelvis slightly to achieve fully the performance position. You will benefit from the increased width & slight curvature of the Gobi shape.