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The world's toughest triathlon

Fancy a swim across an icy Norwegian fjord, a 180km cycle ride followed by a marathon? Try the Isklar Norseman Xtreme Triathlon. The 大象传媒's Gareth Barlow got up very early to watch the start of the race in southern Norway:

(PICTURE: Competitors warming up for the Isklar Norseman Xtreme Triathlon CREDIT: Gareth Barlow)

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Duration:

2 minutes