But in case you've forgotten there's also thousands of people from all over the world coming together to run, swim, play and generally push the human body to its limits. Among them is Lewisham's Conrad Williams, who has been confirmed to take part in the 400m and 4x400m relay.
Williams, who lives in Hither Green, played basketball at Blackheath Bluecoat school and got involved in running when he stumbled across a Kent Athletic Club training session at Ladywell running track..
He's also as far as I know the only Olympics hopeful who has tweeted about training to Old Skool garage and 'Love lewisham market no place like south'. Yesterday he confirmed that he will be 'doing it for the south east'. Go Conrad!