Yes, excellence is by choice the same way that mediocrity is. Being born with a unique talent is not a guarantee that you will excel in life. Regardless of how gifted you are, excellence come as a result of your willingness; you have to crave for it.
It is possible to be better than anyone else in any area that you want; when it comes to how far you can go and how much excellence you can attain you are your own limit.
Excellence costs alot. It demands one’s precious time, effort and a great deal of discipline. You also need motivation, lots of it for that matter. It is impossible to attain excellence and greatness without motivation.