Health Medics a truly dynamic back rest that adjusts as you move, actually following you to create continuous support. The problem with ordinary backrests is that they are all “static”. When you twist and turn in your chair the backrest does not move with you, so it no longer provides any correct positioning. The ErgoBack is different. Its patented design allows it follow and support you while you twist, turn and lean. This helps you remain in the correct ergonomic position.