Here is a little piece of advice that I love from Jeffrey Gitomer:
Love it or leave it. The more you love it, the more you will sell. The more you prepare for the sale, the more you will sell. The more you believe it, the more you will sell.
You can turn this rule into a game.
The more TV you watch, the more your competition is beating you
The more you get out of your comfort zone, the more success you will have
The more positive people you surround yourself with, the more positive you will feel
What rules can you come up with?