10,000 take part in London Triathlon

More than 10,000 people take part in the world's biggest Triathlon in London this weekend.

Celebs including Mel C, Matt Willis and Sir Richard Branson will swim 400 metres in the Docklands, then bike for 10 km and then run for 2.5 km.

Loads of people are doing it for charity including Heart's Toby Anstis who's raising cash for our own Have A Heart Appeal.