Better Sit

Free yourself from lower back pain, increase your flexibility and strengthen your entire body by improving your posture and sitting the right way.
Sitting in one position can not only keep you from all the benefits that other sitting postures offer, but can actually harm your body.
The Better Sit - Floor app not only helps you by reminding you to change positions, but also suggests a new sitting position every time unit.
The app also provides useful information on all sitting postures and research around the topic.