Clay Johnson over at infovegan.com uses attention interval training to increase his ability to focus and concentrate on productive work. From How to Focus:

Neuroplasticity is how your brain changes its organization over time to deal with new experiences. It involves physical changes inside of the brain based on the particular tasks the brain is asked to complete. It’s why the hippocampus of a seasoned taxi driver in London is larger than average, and how a meditating monk grows grey matter. Your brain isn’t a mythological deity but a physical part of your body that needs to be taken care of just like the rest of your body. And your body responds to two things really well — diet and exercise. Let’s presume your brain, being a part of the body, also does.

Johnson uses the Pomodoro Technique to improve and track his attention during work sessions.

Modeled after how I trained to run my first marathon using Jeff Galloway’s technique, I practice attention interval training. I got this timer installed on my computer. It’s an excellent interval timer based on a technique called the Pomodoro technique — but I’m primarily using it based on its ability to make sound, set good intervals, and support logging. I started small: 10 minutes of work with two minute breaks. My strategy has been to keep it so when the timer goes off that tells me it’s time to take a break, I feel like I can keep going. I’m up to 35 minutes now with 2 minute breaks.