We want results. When you start, you want to see physical and psychological benefits. But if you push too hard, you can tire yourself out and end up quitting in frustration. Just when it seems to be drying up, it will spring to life, rejuvenated, and propel you further down the road. Don't be discouraged, even if you've stopped.
Tomorrow is another day.
Many beginners stop and start again 10 or 15 times before they get the habit established. Beginners who don't put pressure on themselves seem to have an easier time staying with it. Your workout starts to become a special time for you. As you make progress you find within yourself the strength and security to keep going. But gradually you begin to change.