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I've found that pomodoro solves two problems.

First, 25 minute is a small, non-frightening investment of time that you CAN do; so it facilitates starting an activity.

Second, since 25 minutes is indeed a short span, the clock usually stops before you have completed the activity (meaning that you know what to do next) and also before you are tired. So after a little rest it is also easy to start another pomodoro. And so on. You keep momentum.