:00:00. > :00:10.Hi, I'm Ricky and this is your live newsround update on Saturday.
:00:11. > :00:15.Astronaut Scott Kelly gives his first interview back
:00:16. > :00:32.And we go behind the scenes at the Velodrome.
:00:33. > :00:41.While British astronaut Tim Peake continues his expedition on board
:00:42. > :00:44.the International Space Station, for others like Scott Kelly
:00:45. > :00:48.After spending 340 days in space, Scott is getting used to being back
:00:49. > :00:51.The astronaut was talking to reporters in America
:00:52. > :00:55.about what life's been like since he returned.
:00:56. > :01:05.Scott Kelly back on Mother Earth after 340 days in space.
:01:06. > :01:08.On Tuesday he touched down on this planet and since then Scott Kelly
:01:09. > :01:16.Yesterday he spoke to journalists in Houston in the US.
:01:17. > :01:20.He told them how his body has reacted to being back on Earth.
:01:21. > :01:23.My level of muscle soreness and fatigue is a lot higher
:01:24. > :01:35.Because it had not touched anything for so long,
:01:36. > :01:41.It is very, very sensitive, it is almost like a burning feeling,
:01:42. > :01:49.It was in February last year when he set off on his mammoth
:01:50. > :01:56.At 340 days, the longest single space flight by a US astronaut.
:01:57. > :01:59.His extended stay on board the International Space Station
:02:00. > :02:05.could help Nasa plan for a possible journey to Mars.
:02:06. > :02:09.He got a phone call from the US president Barack Obama.
:02:10. > :02:18.The ride, it's like going over Niagara Falls in a barrel,
:02:19. > :02:29.While on board the space station, Scott Kelly grew nearly four
:02:30. > :02:40.Although that quickly disappeared because he was back on Earth.
:02:41. > :02:43.Next, 50 hours after kick-off, an epic game of five-a-side football
:02:44. > :02:46.is still taking place outside the studio here
:02:47. > :02:52.It's all in aid of Sport Relief, with ex-professional footballers
:02:53. > :02:54.Alan Shearer and Robbie Savage captaining two teams who've been
:02:55. > :02:56.battling it out in all weathers since Thursday.
:02:57. > :03:03.I popped out a few minutes to see what's going on!
:03:04. > :03:12.eye catching up with some of these girls who are just plain football.
:03:13. > :03:21.-- I am catching up. Playing football. Let's have a look at this
:03:22. > :03:28.medal. Have you seen Alan Shearer? What was it like seeing him? It was
:03:29. > :03:39.cool. Do you know who years? A legend. -- who he is? It is a good
:03:40. > :03:51.atmosphere. It feels good to be part of charity. I want to see what the
:03:52. > :03:57.scores at the end. It is 501 to 438. That is a lot of goals. Giving you
:03:58. > :04:04.can add to that? Probably. Who knows?
:04:05. > :04:06.Next, the Track Cycling World Championships are taking place
:04:07. > :04:11.Britain have won their second gold of the championships thanks
:04:12. > :04:13.to Jon Dibben's win in the men's points race.
:04:14. > :04:15.While Great Britain's women's pursuit team have beat New Zealand
:04:16. > :04:20.Double Olympic cycling champion, Victoria Pendleton, is commentating
:04:21. > :04:27.at the event and sent us this report from behind the scenes.
:04:28. > :04:37.I'm Victoria Pendleton and I'm here in the London velodrome. It was the
:04:38. > :04:41.home of the 2012 Olympics and all the second event on the track. We
:04:42. > :04:45.are on the track centre and at the World Championship competitions. The
:04:46. > :04:48.centre is divided up into little pens for each country and this is
:04:49. > :04:54.where the athletes warm up and prepare for the competitions ahead.
:04:55. > :04:58.There are a lot of things to look at such as rollers which are used to
:04:59. > :05:07.warm up and the bikes go on them and the guys balance on them just to get
:05:08. > :05:10.their legs moving. There are mechanics preparing the bikes for
:05:11. > :05:15.competition and to fix them if necessary after any crashes.
:05:16. > :05:19.Athletes will be getting physio here and will be warming up and preparing
:05:20. > :05:22.and will be talking to their team-mates and just getting ready
:05:23. > :05:28.for the race ahead. This is a very exciting place to be but it is a
:05:29. > :05:31.very tense place to be because it is all about the competition today. As
:05:32. > :05:39.you can see the competition is going on around me the whole time. This is
:05:40. > :05:43.where I started off now I am up there in the commentary box
:05:44. > :05:45.commentating on the cycling events which is a lot of fun so welcome to
:05:46. > :05:54.the track centre. That's all from me, Newsround's back
:05:55. > :05:57.right here in about half an hour. Don't forget to check out
:05:58. > :06:01.the website for all the rest