0:00:06 > 0:00:09This is Blue Peter, but mini.
0:00:09 > 0:00:13Expect epic adventures, makes, bakes, badges, pets,
0:00:13 > 0:00:15presenters and your post.
0:00:15 > 0:00:19We've only got five minutes, so get ready for your Blue Peter adventure.
0:00:20 > 0:00:22Over the last 350 years,
0:00:22 > 0:00:25the Royal Marines Commandos have become famous for being
0:00:25 > 0:00:30one of the toughest, fittest and finest military forces on earth.
0:00:30 > 0:00:33Training to become a Royal Marine Commando is gruelling
0:00:33 > 0:00:36and happens right here.
0:00:36 > 0:00:39We're about to join a group of recruits as they try to become
0:00:39 > 0:00:43commandos and experience some of the training exercises they go
0:00:43 > 0:00:49through on a daily basis to try and get a tiny taste of what it takes.
0:00:49 > 0:00:51We're looking forward to working with Lindsey and Radzi to see
0:00:51 > 0:00:54if they've got the fitness to get through the tests
0:00:54 > 0:00:57and also to see if they've got the mental resilience to get cold, wet
0:00:57 > 0:01:00and dirty and just carry on doing, just as our Royal Marines do.
0:01:00 > 0:01:04We're taking on the legendary commando assault course.
0:01:04 > 0:01:08If you want to be a marine, you have to conquer the course.
0:01:08 > 0:01:11Recruits have to complete it in under five minutes,
0:01:11 > 0:01:15carrying the weight of 13 bags of sugar in kit.
0:01:15 > 0:01:20Under the watchful eye of instructor Ben, we just need to get around it.
0:01:21 > 0:01:23Go!
0:01:25 > 0:01:28First up, jumping the two-metre plunge pool.
0:01:34 > 0:01:36Fantastic! Off to a wet start.
0:01:36 > 0:01:39Now, if we're both going to clear this next obstacle,
0:01:39 > 0:01:42we need to work together.
0:01:42 > 0:01:45- Leg over.- Leg!- Go on, Linds. - Cheers, Radz.
0:01:45 > 0:01:48Here we go. Really fast.
0:01:48 > 0:01:51- Go!- Good. Stay nice and low.
0:01:52 > 0:01:56After the energy-sapping crawl, it's onto the dreaded monkey bars.
0:01:59 > 0:02:02First bar.
0:02:02 > 0:02:05Good effort, Linds!
0:02:06 > 0:02:08Yeah, I'm definitely wet now.
0:02:09 > 0:02:12- Good. OK.- I'm right behind you.- OK.
0:02:12 > 0:02:16As we get to the tunnel, every single one of my muscles is burning.
0:02:18 > 0:02:20There's just one more obstacle left.
0:02:20 > 0:02:23Come on, then, Radzi! Come on, then, Lindsey!
0:02:23 > 0:02:26The massive 3.5-metre wall.
0:02:26 > 0:02:27Come on, Lindsey!
0:02:27 > 0:02:28Blue Peter!
0:02:28 > 0:02:31Come on, sprint finish, Linds!
0:02:34 > 0:02:37We are exhausted.
0:02:37 > 0:02:40Guys, you honestly put in a really good effort there.
0:02:40 > 0:02:43Working well as a team. That was good to see. Did you enjoy it?
0:02:43 > 0:02:45Do you know what? I actually really liked it.
0:02:45 > 0:02:48It's like a massive playground, but it's really, really challenging.
0:02:48 > 0:02:51I found that really hard because I'm not the strongest,
0:02:51 > 0:02:54and getting over those walls, I could not have done without Radzi.
0:02:54 > 0:02:57But it was good. We did enjoy it. At least we're done now, right?
0:02:57 > 0:02:58Not quite, I'm afraid.
0:02:58 > 0:03:02If you could just take a look that way, you'll see the estuary there.
0:03:02 > 0:03:04Shall we get a bit muddy?
0:03:04 > 0:03:08The mud run involves recruits running from one point to another
0:03:08 > 0:03:12through the energy-sapping mud for anything up to an hour.
0:03:12 > 0:03:16So if these guys can keep going, following orders in this mud,
0:03:16 > 0:03:19they can do it anywhere. But can we?
0:03:19 > 0:03:22Away we go then, men! Hurry up!
0:03:24 > 0:03:26Get down!
0:03:26 > 0:03:28LINDSEY GROANS
0:03:28 > 0:03:31Trust me, nothing prepares you for the mud.
0:03:31 > 0:03:34THEY LAUGH AND GROAN
0:03:34 > 0:03:37Just crawling through it is so difficult.
0:03:37 > 0:03:39I've never done anything like this.
0:03:39 > 0:03:44That expression, running through treacle, has never been so true.
0:03:44 > 0:03:47This is... Look at that!
0:03:49 > 0:03:51- Roll over! - As if that wasn't enough...
0:03:51 > 0:03:54How do I look? ..we're told to turn over.
0:03:54 > 0:03:56On your back! Start crawling!
0:03:56 > 0:03:58Push off with your legs! Come on!
0:03:58 > 0:04:01- Push off with your legs! - Toughest thing I've ever done!
0:04:01 > 0:04:04Ben is not letting us get away with anything.
0:04:04 > 0:04:06Away we go! Come on!
0:04:06 > 0:04:07Let's go, guys! Let's move!
0:04:07 > 0:04:11It's getting more and more difficult to keep going.
0:04:11 > 0:04:15- And we've only been doing this for a matter of minutes.- Away we go!
0:04:15 > 0:04:16On your feet!
0:04:16 > 0:04:18Start moving! Come on!
0:04:18 > 0:04:20Come on, you two, let's go!
0:04:20 > 0:04:23On your feet! In we go!
0:04:23 > 0:04:26Thankfully, we're called in.
0:04:26 > 0:04:29That was incredibly tough.
0:04:29 > 0:04:34This is hands down...one of the craziest experiences of my life.
0:04:34 > 0:04:39- I can't even speak.- But for the recruits, that was just a warm-up.
0:04:39 > 0:04:42Now they've got to carry both of us back to dry land.
0:04:42 > 0:04:44On your shoulders! Move!
0:04:45 > 0:04:48- Three, two, one, lift! - LINDSEY SHRIEKS
0:04:53 > 0:04:55Go, go, go!
0:04:55 > 0:04:58Boys, I'm sorry, Lindsey weighs 30 kilos less than me.
0:04:58 > 0:05:01Their training really starts to show.
0:05:01 > 0:05:04They work as a team and carry us across the mud,
0:05:04 > 0:05:07making it look so easy.
0:05:07 > 0:05:10And here's Radzi. He's home.
0:05:10 > 0:05:13Well done, Radz. Well done, boys.
0:05:13 > 0:05:17We've only had a tiny taste of what it takes
0:05:17 > 0:05:20to cut it in this famous force.
0:05:20 > 0:05:24It's been exhausting, but an absolute privilege.
0:05:25 > 0:05:27Each and every one of these guys are incredible.
0:05:27 > 0:05:29If you look up determination in the dictionary,
0:05:29 > 0:05:31you'll see these guys because they're awesome.
0:05:31 > 0:05:33It has been an honour to be here today.
0:05:33 > 0:05:36Not just as a girl being part of the Royal Marines
0:05:36 > 0:05:39just for 24 hours, but also as Blue Peter presenters.
0:05:39 > 0:05:42- Because this is a rite of passage, isn't it, Radz?- It absolutely is.
0:05:42 > 0:05:43We've never looked so good,
0:05:43 > 0:05:46and on that note, which way is the laundrette?
0:05:46 > 0:05:48- It's that way.- Ah.
0:05:53 > 0:05:55Join in every Thursday on CBBC.