We all know the phenomenon of exotic athletes in the first rounds of the Olympics, like the 100 m guy from Samoa, jogging it in 13.5 seconds and later participating in the shot put, too.
Question is: according to which rules were they able to qualify in the past, and would it be possible in the future?
Obviously they don't have neither the qualifying standards nor some kind of IAAF ranking. Is there some kind of wild card or something?