Anyone who has done NaNoWriMo has probably done sprints. You might also have heard of this referred to as the Pomodoro Technique. This technique is designed to help you shut out distractions and get work done in short bursts of productivity. I found this especially helpful when my kids were younger. I had to cram my writing time into naptime, after bedtime, and between getting snacks. I started with 25 minute blocks, but you can start with 15 minutes, and expand as you get more productive or carve more writing time out of your schedule.