Have you ever trained for a marathon? For a beginner who hasn’t done it before, this can look like an impossible task. It can be very discouraging when you are unable to break up your practice sessions into small “meaningful milestones.”
If you were to run a marathon, you don’t want to be sprinting your way through it. When you know in advance that you need to preserve your energy till you cross the finish line, you’d want to pace yourself accordingly. Doing so allows you to not only pass the finish line but also do it in a way that doesn’t make you hate marathons!