I think that Si users tend to make the best athletes. They are the best at organized sports. They made up the majority of your high school football and basketball teams. Most people would probably believe that SP's are the best athletes because they use extraverted sensing but from what I have observed they arent. SP's might do skateboarding or something. NJ's and NP's might play tennis or run cross country. The reason SJ's are good at sports is that introverted sensing is good at living in the moment. Si doesnt just remember facts and memories but is super in tune with the body. This results in good coordination. When Si users receive instructions for a play those instructions are always in the back of their mind which allows them to carry it out successfully.