A simple productivity hack

I have learned a simple productivity hack that is working very well for me. Here it is:

1. Choose one task

2. Set your phone timer for 20 minutes

3. For that 20 minutes just focus on that one task. No email, phone calls, texts, facebook wall posting, tweets allowed

4. Once you are done, take a 5 minute break for all the distractions

5. Repeat

I often get more done in these 20 minute sprints than in one hour of distracting work. How did it work for you?