"Sitting more than six hours a day increases mortality risk", according to a study published by the American Cancer Society that gathered data from more than 123,000 people. We cannot help it sometimes, since we cannot stretch our legs  as much as we would like  throughout our 8 hour working day.
There are many ways to set a routine of a few minute breaks over the day.  StandUp is one of them. It is an Android App through which you can set reminders to take a break, and get up from your desk at least for a couple of minutes.
Its simple interface looks like your smartphone's Alarm app and allows you to set alarms to manage your time and spend some minutes stretching out. It is time to get into a healthy routine!