Here are some great books to improve your performance:
The Power of Habit: Why We Do What We Do in Life and Business – http://amzn.to/2vbMdfa
The Brave Athlete: Calm the F*ck Down and Rise to the Occasion – http://amzn.to/2hA5LGE

In this video Dr. Lance Labno talks about the habit loop and what it takes to get you to make new positive changes in your life.