100% better?

I heard something interesting the other day.  I heard that professional athletes that truly believe that they can achieve a goal perform about 10% better than professional athletes that aren't as optimistic.  Interesting... but then I heard this...

Young boys that truly believe they can achieve a goal perform about 100% better than boys that don't believe.

Two general questions come to mind:

1. Why is it that we do better when we believe in ourselves?
2. What do those little boys have that cause this effect to be so drastic?

But I think this the real question:  Why don't you believe in yourself?

What's the risk?  Seriously... what do you have to lose by believing in yourself?

Today, let's look differently at ourselves.  Believing in yourself has NOTHING to do with the past.  Let's look at ourselves for what we can achieve, not what we have achieved... and maybe we can be 100% better, too.