Three things work for me: 1) Having a minimum realistic goal for the day. By having that realistic goal, I find it much easier to get started, and end up achie

Three things work for me: 1) Having a minimum realistic goal for the day. By having that realistic goal, I find it much easier to get started, and end up achieving more than I set out. 2) Proper cardio exercise - I find just a 5k run really clears my head, makes me feel good, and relieves the physical boredom of essentially sitting down staring at a screen. 3) Breaking up working time into one hour slots (roughly), and having a decent 10 minute break to stand up, have a drink or whatever.