is all about getting healthy and fit,

I thought it'd be fun if we played a new fitness game.

It's time for "Tonight Show" Fittest of the Fit Challenge.

-♪ You wanna get fit, you wanna get fit ♪

♪ Fittest of the Fit ♪

-All right. Our first challenge is called the hang ten.

We have to race along this course matching our hands

and feet exactly to the pictures on the floor.

The first one to finish wins the round.

Okay? Do you understand? -Yeah.

-All right. You -- Are you ready?

Have you ever done anything like this before in your lifetime?

-Never. -Yeah, me neither.

Maybe, like, "Dance Dance Revolution" meets Twister.

It's really fun. -Ooh, you're one up on me.

-All right, but I don't think I'm going to win.

But either way. Hey, confidence. Confidence is key.

All right. Here we go. All right. You ready?

Let's line up. [Blows] All right. On your -- Wait.

I just want to see what -- On your mark, get set, go!

-Aah!

♪♪

-Oh, God!

Oh, God! This is so hard!

-Aah! -Oh, my God! You're killing me!

[ Cheers and applause ]

-[ Laughs ] -Oh, my God!

♪♪

[ Bell dings ] -Whoo!

[ Cheers and applause ]

-[ Laughs ]

God. That was so embarrassing! Oh, my gosh.

-That was harder than you would think it would be.

-It really is tough, man. Can we see that again?

Why? In slow motion. Here we go.

-[ Laughs ]

♪♪

-Oh, my gosh. It was that bad?

Oh, my gosh. What are you doing?

-It's beautiful.

-Now it is time -- I'm like -- Wow. Just clueless.

I'm like, "Hand, foot, what?"

Now it's time for our second challenge.

This is called the Bodzilla. -Yeah!

-And this time, we're going to be working together.

One of us will put on a blindfold and attempt to walk

through this tiny city without knocking over

or crushing any of the buildings...

while the other has to hold a plank

and guide them by shouting out where they should step.

Who's doing the, uh -- Who's doing the planking?

Since you won the last round...

-I -- That doesn't help, does it?

-No, it doesn't. Yeah.

It means you will be walking blindfolded through the city.

And I have to do a plank push-up?

-Just hold a plank. -Just walk really -- Just jump.

[ Laughter ]

Just take a real -- Just start running from there...

-You know, I'm 5'3", and I have super --

I don't -- I'm not tall. -You can do this.

-I don't know if I can -- -Oh, my gosh.

-Blindfolded. But sure. -Aw, bud, you can do this.

All right. You go over there. -Okay.

-And I'll go down here. And then -- Here we go.

It's all about -- -Okay.

[ Drum roll ]

[ Cheers and applause ]

-Ready? On your mark, get set.

All right. Left, left foot, left foot.

Go! Left foot. All right, right foot.

Straight up in the air. Right foot.

Straight up in the air. Straight up.

Yes, yes, yes, perfect! Wow!

Left foot. You're great. All right. Now right foot.

Big, big, big, big -- Yes.

No, no. Yes. No! Yes! Yes! Perfect!

All right. Left foot. Yes. That's -- Stop right there!

Just stop! Just chill out for two seconds.

All right. Left foot up in the air.

Now over, forward, forward. Oh, higher, higher, higher!

Forward. No, no, no! No! Yeah, stop, stop!

Now right foot. Real big -- Giant step!

Yes, and you're done!

[ Cheers and applause ]

-Whoo!

-That was teamwork, man. That was great.

Now, can we see that again in slow motion?

-Yes! -Yes!

♪♪

Look at that! -Ooh!

-Come on. Bodzilla. That's what I'm talking about.

It's time for the final round. This is worth 10,000 points.

-Whoa! I know. They're worth points.

-Whoever takes this round wins. And this is a good one here.

This is called the Huff and Puff Face-Off.

-What do I win?

-We -- Uh -- Um -- -What's my motivation?

-Bragging rights. -Okay. That's enough.

-You have to crouch down into a bear crawl while trying

to blow these three ping-pong balls past the center line.

Whoever has the most balls in the other person's side

after 20 seconds wins the game.

Whew. I'm already out of breath.

I haven't even done anything, and I'm breathing heavy.

What did I do? Are you ready for this?

-Let's do it. -You go over there.

And, hey, good luck. Hey. -Good luck.

May the best -- May the best man win.

-Yeah, or woman. -Or woman.

-All right. Here we go. Drum roll, please.

[ Drum roll ]

On your mark, get set, go!

[ Both blowing ]

-[ Shouts indistinctly ]

♪♪

[ Blowing continues ]

[ Cheers and applause ]

♪♪

[ Bell dings ]

-Yeah!

[ Cheers and applause ]

-I win!

[ Cheers and applause ]

-Carrie Underwood, everybody!

[ Cheers and applause ]