Health experts are unanimous: sitting for long periods of time is bad for your health. As well as giving you a bad back, frequent prolonged sitting is a risk factor for obesity, heart disease and diabetes.

But remembering to take regular short breaks is difficult when you are focused on the job.

GET OFF YOUR BUTT! alerts you to take a break when you have been sitting for too long. You don't have to do anything but keep your phone in a pocket. The app uses the iPhone's accelerometer to monitor your movements.

Sitting times are logged and you can review the number of hours each day you sit, how often you take breaks, and track your progress towards healthier work habits.