Mantras - what's yours?

[MI-XC]

The Mental Game

I’m on my second athlete-centric book, ‘Endure’, (first was ‘How Bad Do You Want It?’). Obviously the big take away from these types of books is that the brain and mind are major factors in deciding performance, e.g. actual fatigue, perceived effort, etc. My open question is: do you do any type of mental training and if so, what does it entail (above and beyond reading the popular books) and has it produced a measurable/material difference in your performances? Thanks!