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Last Updated: Thursday April 03 2008 12:12 GMT


Triathlon athletes in Beijing

Perhaps one of the toughest sports in the games, triathlon is a combination of swimming, running and cycling.

Competitors have to swim in the sea for 1,500m, ride bikes on roads for 40km and then run 10km on roads too.

And it's not as if they get to ride and run on flat bits of land either, the cycling bit of the course has a big hill in it.