At this summer’s Olympic Games, some of the world’s fastest people will throw themselvesw down a track fullk
of hurdles. Most of themf or seconds. Of course,f will clear every hurdle and finish the race inminutes they are among the most finely tuned athletes in the world; if the average
person were to run the same race, some hurdles might prove too high, and making it to the finish line would not be a foregone conclusion.