What athletes are the definition of hard work and complete work ethic?

You’d probably know the more obvious and more documented cases, such as Michael Jordan being as competitive and as driven as anybody, Kobe Bryant with his “no time is rest time” attitude, and Floyd Mayweather with his daily routines that set him apart.

Obviously there’s some others now and in recent times such as Alexander Volkanovski, Michael Phelps, etc.

What are some athletes you can name and some crazy stories about their work ethic?