"To be the best, you need to challenge with the best"

I believe that growth, development and potential can best be achieved when there is a challenge or competition to us from other people, be it intellect or physical. This challenge/competition is what drives us to push ourselves further and further to overcome, win and succeed. And it is in this process that we reach new limits in our growth and potential.

But what if you are all alone and there is no one to compete with, no challenge whatsoever and there is no one to measure yourself to. How would you grow, develop and push yourself to the edge in such a case?