It is called that because you get Athletes Foot from going into locker rooms, and contaminated swimming pools.
athletes are people who do sports as a living
An abnormal increase in the number of circulating red blood cells.
They sweat less, look hotter in spandex, and arent as strong.
They wear out their bodies faster due to all the extra physical exertion that playing a sport professionally takes. Look at Bret Favre, he looks much older than he actually is.