Those of you who are competitive athletes understand (I hope) that it takes a lot of hard work to become the very best you can be. It takes many hours of practice, pushing through injuries and not allowing yourself to succumb to the mental block of giving in because things are just too hard.
There is only one motto I live by when I am training in the gym, on the mat or outside in the pouring rain. That is: Hurt in Practice so you Don't Bleed in Battle! This means very simply that you can not expect extraordinary results with an ordinary effort. The worst thing that can happen to you during a training session is that you get tired. That's all.
If you tear yourself down during practice and aim beyond what your goal is, when it comes time to compete things will be a lot easier on you.
I hope those of you who are training hard for any sport bear this in mind the next time you feel like giving up during a training sesion.