Can ordinary people achieve extraordinary things?

What’s the difference between normal and extraordinary?
It is quite easy to live a normal life. Now, don’t get me wrong — there’s nothing wrong with that, but I’m a firm believer that we’re all capable of achieving amazing things in life.
What’s the difference between mediocrity and excellence?
To me the most significant difference stands behind an individual’s ability to live outside their comfort zone.
Why?

Think about how most of us naturally resist change and how easy it is for us to lay back and end up living under mediocre routines and habits that inevitably lead to mediocre results.