00:05If you've got a question and you don't know where to go, ask Nina for support, cause she's got a
00:10science show.
00:11She makes sense of her senses by helping all her fans, by doing her experiments, with emotions and with bats.
00:17Touch her tongue, fingers, eyes, ears, ears, nose.
00:23Nina and her neurons find out what you need to know.
00:26Nina and her neurons find out what you need to know.
00:29Look, he helps us with our eyes and Felix with our touch.
00:32Ollie sniffs our smells and sends some bells, she hears so much.
00:35But it's Ollie's brother, he helps us with our taste.
00:38Then Nina's little neurons and they're coming to your place.
00:41Touch her tongue, fingers, eyes, ears, nose.
00:47Nina and her neurons find out what you need to know.
00:50Nina and her neurons find out what you need to know.
00:53Oh yeah!
00:58Oh, hello there.
01:00I'm just about to do an experiment to see how fast my swimmer friend can swim across this tub of
01:05water.
01:05So let's see.
01:07Good luck.
01:10Go, go.
01:11You're doing really well.
01:12What a great swimmer.
01:14Oh, I hear a beep.
01:17I see a flash.
01:17I wonder what they're going to ask.
01:23Hi, Nina.
01:24Hi.
01:25We've got a question for you.
01:27How do we swim?
01:29That's a great question.
01:30How do we swim?
01:32Swimming is a really fun sport.
01:34But how do our bodies actually move through the water when we swim?
01:38Why don't you come down to my lab and we'll investigate.
01:41See you soon, Nina.
01:43Bye.
01:44Bye.
01:45Well, I'm going to need some help to answer this one and I know just who to ask.
01:50OK, neurons, time to get to work.
02:08OK, today's question is how do we swim?
02:13Now, which neuron do you think will be most useful in helping us find the answer?
02:17Me.
02:17Me, me, me.
02:18Me.
02:19Will it be Fabulous Felix?
02:22I can help so very much if you need the sense of touch.
02:26Will it be Beautiful Belle?
02:28I send messages to Brain from ear.
02:30If there's a sound, I'll help you hear.
02:32Will it be Lovely Look?
02:34For looking and seeing, day or night, I'll help you with your sense of sight.
02:39Will it be Awesome Ollie?
02:41If it's Polly or Whiffy, but you can't tell, my messages help your sense of smell.
02:45Or will it be Baby Bud?
02:47Sour, salty, bitter or sweet.
02:50I'm your taste buddy whenever you eat.
02:55It's Felix.
02:58Go Felix.
03:00Go Felix.
03:01Go Felix.
03:02Go Felix.
03:03Go Felix.
03:04Go Felix.
03:05Go Felix.
03:05Go Felix.
03:06Marvellous.
03:07A little touch can mean so much, Nina.
03:11Today's question is how do we swim?
03:13When we're swimming, we feel the water all around us.
03:16So Felix, our touch neuron will be helping us.
03:19Right, I need to get the lab ready before the experimenters arrive.
03:24Olivia loves eating pizza.
03:27Nina loves baking.
03:30I like floating on my back.
03:33I like jumping in.
03:35But they both want to know how do we swim.
03:38So today, for one day only, Nina and Olivia become the experimenters.
03:48Hi, guys.
03:49Hi, Nina.
03:50Welcome to my lab and thank you for your great question, how do we swim?
03:54To find out the answer, let's start by using our senses.
03:58Whoop whoop!
03:59A senses experiment!
04:01We're ready, Nina!
04:02Now, there are quite a few different styles of swimming, aren't there?
04:06Now, can you name any?
04:08Crawling.
04:09Yeah.
04:09Can you think of any?
04:10Breast stroke.
04:11That's right.
04:12Very good, guys.
04:13Well, let's take a look at some.
04:15This is the breast stroke.
04:17Your arms go forward and then we pull them back.
04:20You try.
04:21Forward, pull them back.
04:24That's it.
04:24Keep going.
04:25Ooh.
04:26Heh, heh, heh.
04:27Good.
04:28HE LAUGHS
04:32That feels simply marvellous.
04:35Now, what about this one?
04:38This is the front crawl.
04:39You put your arm out in front of you and pull it down under the water and then do the
04:44same
04:44with the other arm.
04:46So, you guys do it too.
04:47Whoop.
04:48Whoosh.
04:49Oh, very good.
04:50Very good.
04:51What about the doggy paddle, Nina?
04:54Oh, yes.
04:55Let's not forget my favourite stroke, the doggy paddle.
04:59Ooh, thanks, bud.
05:01Hee, hee, hee, hee.
05:02Ha, ha, ha.
05:03So, look carefully and tell me what parts of the swimmer's body are moving.
05:08Their arms and legs, Nina.
05:10That's right.
05:11When we're swimming, we use our arms and our legs.
05:14But how do they help us move through the water?
05:17Well, let's get experimenting.
05:20So, we know that we move our arms in different ways when we're swimming different strokes.
05:25But why do you think we move them?
05:28To go through the water.
05:29Yes, our arms pull us through the water.
05:32When we're swimming, our hands are a bit like a paddle and they pull us through the water like this.
05:39Do you want to try?
05:41Make your hand like a paddle.
05:43Listen.
05:47What does it feel like?
05:49It feels like we're pulling the water.
05:52So, their hands act like a paddle, which means you can pull more water.
05:57And move through the water more easily.
06:01That's right.
06:01Well done, neurons.
06:03This is a great shape for our hands and our arms when we're swimming because we pull lots of water
06:09towards us and it helps us to move.
06:11But what about our legs?
06:14How do they help us swim?
06:16Time for another experiment and I know just the place.
06:20Oh, it's somewhere warm and bright with lovely clear blue water.
06:24Let's go.
06:30Hmm.
06:31Where do you think we're going today?
06:33Somewhere bright with clear blue water.
06:37I can't wait.
06:39A beautiful lake, perhaps?
06:40No!
06:41I hope it's the seaside!
06:44Something's got a strong smell, but it's not the seaside.
06:48I can smell chlorine.
06:49It's a swimming pool.
06:53So, we know that you both can swim and you should always swim with an adult.
06:58And to keep an extra eye on us today, we have Chris, our lifeguard.
07:01Hi, Chris!
07:02Hi!
07:03Hi, guys.
07:04Now, you're both holding floats, which means you won't be using your arms, just your legs.
07:10So, can I ask you to kick your legs for me and we'll see what happens.
07:14Go!
07:14Go!
07:17Go!
07:18Go!
07:19Stop!
07:19Stop!
07:20Stop, stop, stop, stop, stop, stop.
07:21So, what happened there?
07:22We moved forward.
07:24Yes, you weren't using your arms, but your legs pushed you through the water.
07:29Well done.
07:30So, this time, you're holding on to the side of the pool and I want you to try kicking again.
07:35Yay!
07:36Splish, splash, splish, splash, splash.
07:40Stop kicking and relax.
07:43Ooh!
07:44Now, what happened to your legs when you stopped kicking?
07:48We dropped down in the water, Nina.
07:50That's right.
07:51Kicking keeps your legs up near the surface and also helps to keep your body flat in the water.
07:58Why does a flat body help, Nina?
08:01Great question, Belle.
08:02Keeping our bodies as flat as possible makes it easier to move through the water when we swim.
08:08So, now we know that our arms pull us through the water and our legs push us through the water.
08:14But which one helps us most with our swimming?
08:18Time for another experiment.
08:21So, your question was, how do we swim?
08:24And so far we've discovered that swimmers use their arms and legs in lots of different ways.
08:29And these are called swimming strokes.
08:31So, let's have a look at Ruri and Alistair swimming.
08:37Do you know what stroke they were doing?
08:40The breaststroke.
08:41Now, Ruri and Alistair did the breaststroke at the same speed.
08:45But this time, Ruri is only going to use his arms and Alistair is only going to use his legs.
08:52So, who do you think will be fastest?
08:54I think the one using their arms.
08:56I think the one using their legs.
08:59Well, let's see.
09:01Are you ready, swimmers?
09:04Ready, steady, go!
09:07Yes!
09:08Come on!
09:09Come on!
09:10You can do it!
09:11You can do it!
09:22Now, watch carefully.
09:24You can see that Ruri is pulling the water with his arms and hands.
09:29And Alistair is pushing the water with his legs.
09:33Froggy legs is leading.
09:43So, who finished faster?
09:45The legs always were near.
09:47Yes, Alistair, who's just using his legs to push through the water, won the race.
09:53And that's because, in the breaststroke, our legs help us to move much more than our arms do.
09:59So, let's try the same experiment again, but this time with front crawl.
10:11But this time, Ruri is only going to use his arms, and Alistair is only going to use his legs.
10:16So, who do you think will win?
10:18Arms only, Mima.
10:20Ned's only.
10:22OK, well, let's see.
10:24Are you ready, swimmers?
10:27Ready, steady, go!
10:31Woo!
10:34Now, watch carefully.
10:35Now, watch carefully.
10:35You can see that Ruri is pulling the water with his arms and hands.
10:39And Alistair is pushing the water with his legs.
10:45Yay!
10:49Yay!
10:49Yay!
10:49Hee-hee-hee-hee!
10:51Ha-ha!
10:52So, who finished faster?
10:54Was it arms-only swimmer or legs-only swimmer?
10:58The arms-only swimmer, Nina.
10:59Yes, Ruri, the arms-only swimmer was faster,
11:03and that's because in the front crawl,
11:05our arms move us much more than our legs do.
11:08So for breaststroke, the legs are important.
11:11Because froggy legs move us quickly.
11:14And in front crawl, most movement comes from the arms.
11:19Well, remember, neurons.
11:21And thank you very much to our brilliant swimmers.
11:23Thanks, guys. Bye.
11:25The great thing about swimming
11:27is that bodies of all shapes and sizes
11:30can move quickly through the water.
11:32We can use the swimming stroke that suits our body.
11:38These are Paralympic swimmers.
11:40They've found the best way to use their arms and legs
11:43to move as fast as they can.
11:45Those swimmers are amazing.
11:48Yes, look, swimming is a brilliant sport for everyone.
11:56So your question was, how do we swim?
11:59And I think we've answered it.
12:01Swimmers move their arms and legs in different ways.
12:04For some strokes, our legs push us through the water.
12:09And for others, our arms and hands pull us through.
12:12And once you find your favourite stroke,
12:15swimming is brilliant fun.
12:18So I hope that's answered your question.
12:20Thanks, Nina. Bye.
12:23You're welcome. Bye.
12:27If you want to know more about the science that's all around us,
12:30go to Nina's section on the CBB's website.
12:32Have fun.
12:46If you're itching for some exercise
12:49from your head down to your toes,
12:51why not try out something new
12:53and give it a real go?
12:55Whenever you are restless
12:57and feeling kind of bored,
12:59grab your friends and go outside
13:01and try a brand new sport.
13:06Get sporty.
13:08Do-bi-do-bi-do-bi-do-bi-do-bi-do-bi-do.
13:10Get sporty.
13:12Do-bi-do-bi-do-bi-do-bi-do-bi-do.
13:15Spinning, throwing, running, jumping.
13:17Lots of fun to do.
13:19Cycling, diving, sliding, rolling.
13:21It's really up to you.
13:23If you're wondering how a swimmer swims
13:25or a bike can go so fast,
13:28give it a bash and make it last.
13:29It's time to go get sporty
13:51And remember, whether it's inside, outside, on a bike or in a pool
13:55We can all try something new and get sporty
13:58See you again soon
13:59Bye
14:00Get sporty
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