02:00Olympic Taekwondo2008Women's 57kg and Men's 68kg PreliminariesBBC Sport Duration: 4 hours Thu 21st Aug 2008, 02:00 on Satellite and Cable SixLive coverage of the women's 57kg and men's 68kg preliminaries.GenresSportOlympicsSportTaekwondoBrandOlympic TaekwondoSeriesOlympic Taekwondo: 2008 Source: BBC Online