Arione R3 is for The Snake: Flexible Spine. If you are very spinally flexible (far less than 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 Snake. You achieve the performance position using your spinal flexibility alone, not rotating your pelvis at all. You will like the flat, narrow & long shape of the Arione.