first I've heard of this technique, but one thing I've discovered for myself is that especially when I'm engaging a task I'm not particularly eager to do, I'll set a timer and tell myself “OK, you’re going to FOCUS and work on this for the next 20 minutes and then you’re done for today and you’ll move on to something else.” in doing this I find it easier to break the inertia and engage what I need to be working on. If instead I say “I've just gotta work on this until its finished or until I'm tired, my brain doesn’t really know what that means and doesn’t really engage the task.”
so I find the benefit twofold. First, it helps me break the inertia. “I can do just about anything for x minutes.” Second, the timer helps me really focus. I’m just doing this task and this task alone for this discrete amount of time, so no interruptions, let’s get on it and get it done.