Watch a video about the historic event in the player above.
The sports moments you need to watch out for
When Smith and Carlos raised their fists in Mexico City
40 sec
When Ben Johnson went there for doping
50 sec
When Hassiba Boulmerka ran in shorts
46 sec
When Jesse Owens won four Olympic golds in 1936
35 sec
When Sarah Voss covered her legs
43 sec