Recommendation of the Back App from Pilates and Back4good practitioner By Mike Dilke on May 21, 2013 in Uncategorized ‘After trying many chairs and stools, I chose to buy the Back app stool. Best for comfort, ergonomics design and style. No complicated adjustments. One fits all so you can share it with everybody! Love it and so do my clients!’ Murielle Carrasco, Pilates teacher, Back4good practitioner and Posture4u owner.