This is a great thought to consider, especially since 4 months ago I could not even run half a mile without stopping and being short of breath. A good motivational quote when training for a half marathon :)
Runner Things You know that feeling when you get done with a workout and your shirt is soaked, you're dripping, a little shaky from the exertion. That's when I think, "I did it again, I really did it." And I know I can do it again tomorrow.