You'll learn to train smarter, with more intensity, and yet reduce risk of injury because you'll gain a new sensitivity to your body's signals. You can begin to tune into to a channel of energy that perhaps you've never experienced before and broaden your perspective of what is possible. The greatest barriers in our quest to excel are the psychological ones that we impose on ourselves, often unconsciously. With proper and regular mental training you can learn to work through these obstacles and enhance your self-confidence. You'll find that as your beliefs about your limits change, the limits themselves begin to move.
Beliefs give rise to reality.
One becomes an Olympian and the other ends up as a mediocre runner, never making it beyond a few local races. The answer lies is in one's motivation and in using what one has to the fullest capacity. My personal experience in consulting with top athletes over the past 20 years has taught me that there is a collection of mental skills and attributes, all of which are learned, not inherited , which are characteristic of successful performers. These are the cardinal skills which anyone can acquire. There needs to be a hunger, a fire inside which fuels your passion to achieve an important goal, regardless of your ability level.