One solution that usually works for me is to get a standing workstation and use it. Not one of those fancy ones that go up and down. Just one that is permanently up, like the Ikea standing desk hack. For a break, you can move and sit somewhere else. Standing takes a lot more energy, so, it is my belief, that you focus better because if you are standing and goofing off, you are wasting precious energy. There are times where you don't have the energy to stand but need to work - so just sit. Standing and sitting is not a either/or thing. You don't have to be faithful to your standup desk, go slouch in a couch for a break.

The biggest difference between standing and sitting is that walking away from your workstation is friction-free. You just move your feet.