Recently I discovered the amazingness of the Pomodoro Technique. Basically, you work for 25 minutes and then take a 5 minute break. After four of those 25 minute work intervals (with the resulting 15 minutes of breaks), you take a longer, 15 minute break.
The idea is that by splitting up your time into smaller, super-focused chunks, you're more productive overall.
I downloaded a free Android app called Pomodroido (I'm sure there are equivalents for Apple) that times your 25 minute work periods and your 5 and 15 minute breaks. Obviously, you could just use a normal timer or look at the clock. I like the app, though :)
I've been using the app for the past few weeks, and I have to say- it's AWESOME! I feel like I've gotten much more done during my work hours than I would normally. I force myself to stay on task for the whole 25 minutes (which surprisingly is tough sometimes, haha) instead of stopping to do some other "pressing" task that gets me completely sidetracked. I keep a notepad near me so that I can jot stuff down to remember to do later.
I try to make the 5 minute breaks active- I might stretch or just walk around the house a bit- to keep energized throughout the day. Sitting at my desk, staring at my laptop, can be a little draining.
I know this technique isn't possible for every work environment (not sure you can tell your boss to "hold on for 12 more minutes, I'm in the middle of a Pomodoro!") but if you can try it, I highly recommend it!
Even putting this to use in your home-life would be beneficial- see how much you can clean/vacuum/prep for dinner in 25 minutes, then take a break!