For the past 14 years I've been studying the structure of the body and suggesting ways clients can improve their posture at home or work. I've recently found a postural device that is good for sitting in a chair or on the floor cross legged. So I'm pleased to now sell Nada-Chair. I currently have the Back-Up device in my office for you to try and purchase. I can order any other system for you and have it directly shipped it you (no extra shipping fee). I'm happy to discuss which device is best for you. Please watch my video to understand why as a postural massage therapist I recommend this device and how to use it.