0:00:06 > 0:00:08This is Blue Peter - but mini.
0:00:08 > 0:00:10Expect epic adventures,
0:00:10 > 0:00:13makes, bakes, badges, pets,
0:00:13 > 0:00:14presenters and your post.
0:00:14 > 0:00:18We've only got five minutes to get ready for your Blue Peter adventure.
0:00:20 > 0:00:23We've been training hard for a very special challenge.
0:00:23 > 0:00:25That is so tiring!
0:00:25 > 0:00:27That's probably the hardest thing I've done yet.
0:00:27 > 0:00:29It's a wheel-ly tough challenge we were set
0:00:29 > 0:00:32by cycling legend Sir Chris Hoy.
0:00:32 > 0:00:34Hi, Barney and Radzi, your Sport Relief challenge
0:00:34 > 0:00:37is going to push your cycling abilities to the limit.
0:00:37 > 0:00:39We're taking on a mini omnium.
0:00:39 > 0:00:42Basically, it's the best of three different track races...
0:00:46 > 0:00:50And after three months of training, it's finally race day.
0:00:50 > 0:00:54We'll be competing in front of 3,500 people
0:00:54 > 0:00:56and some of the world's best cyclists.
0:00:56 > 0:00:58No pressure then!
0:00:58 > 0:01:01To help settle our nerves, our coach, Charlie...
0:01:01 > 0:01:03- Morning, lads. - ..has a surprise in store.
0:01:03 > 0:01:05- Wow, look at that! - Look at those!
0:01:05 > 0:01:08Our very own Blue Peter cycling outfits.
0:01:10 > 0:01:13Now we look the part, there's only one thing for it - let's race!
0:01:16 > 0:01:18First up...
0:01:18 > 0:01:21We will take in turns to try and set the fastest time
0:01:21 > 0:01:23on one lap around the track.
0:01:24 > 0:01:25And I'm up first.
0:01:25 > 0:01:28- CROWD CHATTERS AND CHEERS - Up on the track!- Come on, Barnes!
0:01:28 > 0:01:30Now all I need to do is remember my training -
0:01:30 > 0:01:33get to the top of the track, build up speed and wait for the bell
0:01:33 > 0:01:37before dropping down and going for it on my final lap.
0:01:37 > 0:01:38Come on, Barney - up, up, up!
0:01:38 > 0:01:40- Up, up, up!- Go, Barney!
0:01:40 > 0:01:41No, no, no, no, no, no, high!
0:01:42 > 0:01:46- Agh.- I'm not sure why Charlie's shouting at me.
0:01:48 > 0:01:50He timed it wrong.
0:01:50 > 0:01:53But when I hear the bell I realise my mistake -
0:01:53 > 0:01:56I've dropped down a lap too early.
0:01:56 > 0:02:00Come on, Barney! Come on! Come on!
0:02:00 > 0:02:02I try to sprint for two laps instead of one
0:02:02 > 0:02:04but my legs are in agony.
0:02:04 > 0:02:07I can't believe it - the one event I've always been strongest at
0:02:07 > 0:02:10and I've thrown it away. I am gutted.
0:02:10 > 0:02:11Is that it?
0:02:13 > 0:02:15Unlucky, Barney.
0:02:15 > 0:02:16Now it's my turn.
0:02:19 > 0:02:20I keep as high as I can
0:02:20 > 0:02:25and when it matters, I drop down on the bell just as my last lap starts.
0:02:29 > 0:02:32But I go a bit wide on the corner and it's slowing me down.
0:02:32 > 0:02:35Hold your line! Hold your line! Come on, that's it!
0:02:35 > 0:02:38My legs are burning but I keep on pedalling.
0:02:38 > 0:02:41Come on, Radzi. This is the last bend - I have to go for it now!
0:02:44 > 0:02:47Oh, I've done it - beating Barney by three seconds.
0:02:49 > 0:02:50That's one to me.
0:02:51 > 0:02:53I just gave that everything.
0:02:53 > 0:02:55Absolutely everything.
0:02:56 > 0:02:58Next...
0:02:58 > 0:03:01A tactical race with both riders going head-to-head on track
0:03:01 > 0:03:05and sprinting flat out for the finish.
0:03:05 > 0:03:07And before we hit the track, our training partners,
0:03:07 > 0:03:10Josh and Tilly, arrive to offer us some advice.
0:03:10 > 0:03:12Josh, I'm in trouble. What can I do?
0:03:12 > 0:03:14Make sure that you can always see Radzi
0:03:14 > 0:03:16so that you can anticipate his moves.
0:03:16 > 0:03:19- OK. Tilly?- I think you need to move around the track -
0:03:19 > 0:03:21- confuse him a little bit.- I can do that, I reckon.
0:03:21 > 0:03:23Doesn't take a lot to confuse me, you know that, mate.
0:03:23 > 0:03:24Let battle commence.
0:03:24 > 0:03:27Come on, Barney. Go, Radzi.
0:03:27 > 0:03:30I decide to take the lead early and see what Radzi does.
0:03:30 > 0:03:33Don't you worry, Barn, I'm close behind.
0:03:33 > 0:03:34I got you, Radz.
0:03:34 > 0:03:36I'm trying to keep an eye on Radzi
0:03:36 > 0:03:39but it's hard looking over your shoulder.
0:03:39 > 0:03:42I'm hanging back for a surprise attack.
0:03:44 > 0:03:46As the bell rings, I decide to go for it.
0:03:48 > 0:03:51My only hope this to overtake him on the bend...
0:03:51 > 0:03:53but again I go wide!
0:03:55 > 0:03:59I try to catch him but he's left me so much to do.
0:04:00 > 0:04:02I have no idea where Radzi is any more.
0:04:02 > 0:04:06My head is down and I'm going for the line.
0:04:06 > 0:04:08..and that makes it one-all.
0:04:08 > 0:04:11I tried so hard to come back at you then!
0:04:11 > 0:04:14You were just absolutely pedal to the metal.
0:04:14 > 0:04:18Once that bell went, I didn't know where you were.
0:04:18 > 0:04:22So, I took the flying lap, Barney took the sprint.
0:04:22 > 0:04:25It all comes down to this.
0:04:25 > 0:04:27Only one of us can win this.
0:04:27 > 0:04:30This is the decider...
0:04:32 > 0:04:34Starting from opposite sides of the track, we have just four laps
0:04:34 > 0:04:37to try and catch each other up.
0:04:37 > 0:04:40First person across the finish line wins.
0:04:40 > 0:04:41You know what you're doing,
0:04:41 > 0:04:44I just want to see you get it all out on the track.
0:04:47 > 0:04:48And we're off.
0:04:48 > 0:04:51I get a better start and pedal as hard as I can.
0:04:51 > 0:04:55- It takes me a while to build up my speed.- Come on, Barney! Come on!
0:04:55 > 0:04:57After the first lap, it's neck and neck.
0:04:57 > 0:04:59And I've decided to go for it.
0:04:59 > 0:05:01Go, Radz!
0:05:01 > 0:05:03But will I last the whole race?
0:05:04 > 0:05:07I'm still in this. I just have to keep on pushing.
0:05:08 > 0:05:13I begin my last lap but my legs are really starting to tire.
0:05:13 > 0:05:16Me, too. I'm giving it everything and I have no idea where Radzi is.
0:05:16 > 0:05:21I can just see Barney. For the first time, I know I'm catching him.
0:05:21 > 0:05:23I see the finish line and I realise I've done it.
0:05:23 > 0:05:24Thank you!
0:05:26 > 0:05:28I may have won but more importantly
0:05:28 > 0:05:31we've absolutely loved this challenge.
0:05:32 > 0:05:33Join in every
0:05:33 > 0:05:35Thursday on CBBC.