ESTPs are often called "energizer bunnies" for their ability to keep going and going. I have an ESTP son who tires me out with sports, he can play baseball, tennis, or basketball for hours, long after his friends have passed out. He doesn't get progressively tired like I do (I'm an ENTP), but rather hits a wall and then stops or goes to sleep.
With the current popular trend of "deliberate practice" influencing sports and music, a lot of attention is being placed on nurture overcoming nature - that hard work is far more important than talent. I agree with this view, and try to apply to it my daily life, but could it also be that practicing hard comes easiest to ESTPs?