(原创)marathon : you can say that this match tests the limit of people`s endurance and strengh. it also present the olympic motto :FASTER,QUICKER,STRONGER。 you can talk something about the history of the marathon that a hero realized his value and consist keeping the 42km. what`s important about a speech is that you should be very confident and full of energy . Don`t be shy in the period of the speech. what`s more,make full preparations is necessary for everybody. At last , wish you good luck!