The Stand4HealthApp
If sitting too long is harmful, then you need to move more often! For those who are in a chair all day at work, Dr. Douglas J. Taber has designed a simple reminder app called Stand4HealthApp, which is available at the iTunes AppStore and for download on Android devices.
When you sit down at your workstation, just set the Stand4HealthApp, and you will be reminded to get up and move a bit every 20-minutes.