Last updated at 11:36

How Sir Chris Hoy became Team GB's best ever Olympian

Newsround takes a look back at how Sir Chris Hoy became Britain's most successful Olympian.
Chris was back at the Olympics in Athens in 2004 and this time he took gold!
Sir Chris Hoy at the Athens Olympics.
And then to top it all off at Beijing Chris won the men's individual sprint - bringing his total for the 2008 games to three!
Sir Chris Hoy at the Beijing Olympics.
But one wasn't enough for Chris, and he sped off to take gold in the men's keirin competition. It's one of the hardest races - eight laps long, and for the first five and a half laps, riders have to stay behind a motorbike before going for a speedy finish.
Sir Chris Hoy at the Beijing Olympics.
Then four years later the super Scot was back again and, along with Jamie Staff and Jason Kenny, took the team sprint gold in Beijing.
Chris Hoy, Jamie Staff and Jason Kenny in Beijing.
After his amazing performance in Beijing Chris got another medal to add to his collection. He was given a knighthood by the Queen and became Sir Chris!
Sir Chris Hoy with his knighthood.
The London Games - Chris and Jason were back to defend GB's team sprint title, this time with Philip Hindes at the front. The team won gold bringing Chris' medal total to five!
Chris Hoy, Philip Hindes and Jason Kenny in the team sprint.
Then to Chris' last event, the men's keirin. He won, taking his gold medal total to a record breaking six! Afterwards he said he is 99.9 percent sure that this would be his last Olympic appearance.
Chris Hoy celebrates winning his record sixth gold medal.
Chris now beats super rower Sir Steve Redgrave as the most successful British male Olympian ever.
Sir Chris Hoy with Sir Steve Redgrave.
Chris Hoy made his first Olympic appearance back in the year 2000 when he won a silver medal in the team sprint at the Sydney Olympics. Can you spot him down at the bottom?
Chris Hoy with the rest of Team GB's silver at the Sydney Olympics in 2000.