Sit more upright with less effort
Based on two studies where people sat upright without a backrest and attempted to keep a natural posture, or performed a typing task. The conclusion was that the outer stabilizing muscles are less active when sitting on the Back App. Lumbar flexion was significantly reduced and so was the activity of one of the main lumbar muscles. The conclusion was that sitting upright on the Back App is easier than sitting upright on an ordinary office chair. You are able to sit upright for longer without a back rest while using the Back App.
Manual Therapy (Volume 17, Issue 6) Pages 566-571
Ergonomics (Volume 55, Issue 12) pages 1586-1595
"Lumbar posture and trunk muscle activation during a typing task when sitting on a novel dynamic ergonomic chair". Kieran O'Sullivan, Raymond McCarthy, Alison White, Leonard O'Sullivan & Wim Dankaerts 2012.