The marathon is an exciting event in any year as runner push themselves to the extreme limit of their body to complete the over 42-kilometer race.But during the 1968 Mexico City Olympic,three runners performed such great acts that the race is considered a truly historic event.One of the runners,Abebe Bikia from Ethiopia,was famous for having won the Olympic marathons at the Rome and Tokyo games.He hoped to win a third in Mexico City.Bikila was really strong as he began the marathon.But at the third of the way into the race he suddenly dropped out