Awaken the Giant Within by Tony Robbins (1991)
Tony Robbins' books have a lot of energy and he is one of the biggest names in coaching, having worked with the greatest athletes and businessmen. I thought I should at least make sure I didn't miss any important piece of wisdom, so I decided to read one of his books. The big advantage of this book is that it is quite short and can be read in less than 2 hours.