Sam put them together for me.

I'm scared, but we're going to learn something together.

Let's get started.

These spins, these dismounts, this is where the danger comes in.

Get to the vertical for the last move, but on the high bar, she's working quickly, efficiently.

I feel a dismount.

Oh dear.

Concussion, broken nose, zygomatic arch fracture.

I hated the way she was rolled over.

If she had a cervical injury there, that would be a really bad way.

You got to support the neck when you do that.

No.

She's up.

No.

No, no, no, no, no.

I hope she didn't compete after that.

That would be so wrong.

From a concussion standpoint, once you get the first one, just because you feel fine, doesn't mean you should go back in because now your brain's even more sensitive to worse injury.

Oh, wrestling.

A lot of cauliflower ear, a lot of dislocations.

Elbow? Elbow?

Was that elbow?

Falling on a weird angle like that on your elbow, it could be very devastating.

In situations like this, it's usually more of a simple dislocation where you're tearing ligaments.

Complicated or complex one would be your broken bones.

What can be dangerous is if you do have significant damage to that area, especially with a broken bone, you can tear arteries, which can cause massive bleeding from the brachial artery,

but also massive nerve damage that can then predispose to issues with the hand.

And as we know, the hand is very important, as occupational therapists can attest, so tipping my cap to occupational therapists and all the great work they do.

Torn ligaments are painful injuries to deal with at the beginning of times, but for Olympic gymnast Keri Strug, it had to be ignored. - Very painful.

When her US teammate left the vault having just missed the 9.4 needed to win the gold, it was down to Strug's remaining two attempts to secure the top medal.

Wait, she did it on a torn ligament?

When she limped back after falling during her first attempt, something had gone very wrong.

Strug knew that she had to land her second attempt as she made her way to the start.

That's so dangerous.

She landed on one leg. What a champ.

Her second landing involved the slightest of touchdown on both feet and then a hop to the uninjured one to stay upright.

Her efforts carried the team to gold at Atlanta 1996.

Impressive.

And also what the announcer didn't say, is that when you have a tear of ligament like that , especially initially, you get this massive inflammatory response where the knee essentially locks up on you.

When you tear a ligament, it bleeds.

So you have bruising in the area, you have swelling in the area, edema, all this buildup so that you have no range of motion with that.

And you don't even know how she sprinted through it.

BMX, oh my god, everyone's falling on their faces.

Some concussions, especially with that level of speed and deceleration, lots of symptoms, brain fog, difficulty concentrating, light sensitivity, noise sensitivity.

Imagine you're a young person now, every time you go out to a party, there's loud noises and lights, you can't even be comfortable.

That's the smallest part of it.

And that's really the culmination of the camaraderie that we see.

Oh.

What the heck happened?

Just a really awkward fall into the sandpit.

He had a hamstring tendon tear, a knee contusion, a tear in the ligaments of the right foot.

Interesting.

I'm surprised he didn't tear his PCL based on the motion of his knee moving back.

I guess a foot got caught on the jump, on the explosive part of the jump.

That's going to be a really long rehab process, 8 to 12 months.

And Angelica Bengston of sweet...

The pole vault as an event scares the life out of me.

You're going fast, there's a giant sharp object, and it reminds me of the Knight's Tale, jousting.

Watch what's happening here on her third attempt.

She looks okay, but where is that piece flying to?

I paused it and I see the trajectory.

Oh, it didn't fly.

Oh, she's okay.

Oh, the pole broke.

Does that happen?

Is that a faulty pole?

There are multiple instances of this happening at the Olympics.

FPS, faulty pole syndrome.

New diagnosis.

Some people thought I'm a first person shooter, but no.

I was worried because of where I paused it that that piece was shooting out into the air.

I hope so, I mean your stick broke.

Oh, and she did it.

That's what I always say, if you fall off the horse, get another pole.

Just like in Formula One, you want to be in pole position.

If the pole, the first pole isn't in the north, try going south.

Contribute to your local polling station.

Did he get hit by the stick on his finger?

Did he get stick?

Did he get finger stick?

Oh no, not finger stick.

Penile stick.

It was pole on pole violence.

Oh my God.

That's just a freak accident because it's not usually what happens.

It's so rare, but it can happen.

And what are you doing?

You're flying 16 feet, 17 feet.

Good luck trying to avoid your pole from getting cut.

That's two pole accidents.

This is becoming very polarizing.

We're out of the pole clips now so, glad you got it out of your system.

Francisco Lazaro overheats. This Portuguese marathon runner was his country's flag bearer during the 1912 Summer Games in Stockholm.

This only makes the tragedy hit that much harder.

It's very easy to overheat when performing vigorous activity.

And overheating doesn't just mean temperature.

It also means fluid and electrolyte dysregulation.

And when you have that, that ultimately causes organ failure.

And when you have organ failure, then you have even bigger problems.

Before the marathon, Lazaro covered his body in animal fat to help prevent sunburn.

I guess before sunblock, there were other avenues.

This layer of fatty wax prevented his skin from sweating.

Yeah, I was gonna say, that feels weird.

And he suffered a fatal imbalance of electrolytes.

Because by putting that fat, you essentially put a lipid layer over your skin, therefore making your pores clogged and making it difficult to have proper sweating, and thereby proper evaporation, and thereby proper cooling.

With less cooling, you can develop serious symptoms of heat stroke.

He collapsed 19 miles into the race and passed away with a body temperature of 105.

He became the first athlete to die in the modern Olympics.

And 23,000 people attended his memorial service in the Olympic Stadium.

This is why it's so important that when you're sweating a lot, you're losing a lot of fluids, you understand that you're also losing a lot of salt.

And that's why professional athletes really take their electrolyte balance seriously and consume enough salt, especially throughout their events.

That's why when I look at something like Prime Energy, it doesn't have enough salt in it to do the trick.

And I know why they don't add the salt.

It would make it a better athletic beverage, but it would make it taste worse, therefore less people would buy it.

In the second half, New Zealand's Katie Glynn suffered a nasty head injury.

Did she get hit in the face?

Oh, right in the back.

Chris Avila did this so much to me during my match.

I swear to God, I was actually telling the ref one time, like hit me in the back of my head and then my legs tripped up.

I was like looking at the ref for like, "Hey man, say something to him."

And people thought I wanted it out.

I didn't want out.

I wanted a fair fight.

Five staples and two sutures later, Glynn returned to the pitch and completed the game.

Same day?

Wow, champ.

Penalty shootout.

Let's hug.

This looks like fun.

And she slots it home.

Was that good?

The Netherlands are through to the gold medal game.

Wow.

Well done, Netherlands.

Good at soccer and field hockey.

I'm sure a bunch of other sports, the silly ones I'm aware of.

Within the men's 400 meter final, viewers around the world were united behind more than a team, but also one injured athlete.

Just over halfway through the 400 meters semifinal.

Oh, I saw it pop.

You have to pull up like that.

Yep, that's happened to me before.

And rehabbing it is so, so difficult.

I mean, you have to be very, very careful because any explosive movement can just re-trigger it.

In fact, I'm not going to lie, when I had it pop the first time, every time I sprinted after it, even if I was warmed up, ready to go,

I still had this like little traumatic feeling in the back of my head that I needed to take it easy on that hamstring.

The image of Derek Redmond hoisting himself up, limping on, and then carried over the finish line by his own father to a standing ovation because Derek had to finish his race has become nothing short of historic.

Pretty sure that's illegal.

You can't have someone help you over the finish line.

In the springboard preliminaries, Greg Louganis met disaster.

Oh, what happened?

It would be one of the most haunting and memorable moments of the games.

He's doing good. He's doing good. He's doing good. He's doing good.

Is he going to hit his head?

I have to pause it.

Is he going to hit his head?

No. No. Oh my God. I feel it.

Oh.

Oh, I'm so worried for his cervical vertebrae.

He did come immediately out of the pool and was assisted.

Are they holding his hand?

Into a training room and they worked on him.

They worked on him.

I mean, I think they needed to get him stacked to an emergency center with his C-spine stabilized.

Louganis struck his head on the diving board mid-attempt, suffering a concussion, not to mention a gnarly wound that required multiple stitches.

I can't imagine how much bleeding there was.

The scalp bleeds so much.

On his very next qualifying dive, Louganis earned a high score to advance to the finals.

Wow.

Overcoming the fear and the trauma of it all.

Conversations around Louganis' head injury took on a second life after he publicly came out at the 1994 Gay Games and published an autobiography announcing to the world that he was HIV positive.

Some people, including prominent members of the IOC, criticized Louganis for not disclosing his HIV status immediately after his injury.

Oh, that's interesting.

Because for me as a boxer, for example, because I have a professional boxing license, I had to submit HIV and hepatitis testing before my boxing match.

That was the norm.

I'm surprised that the Olympics still do this.

Maybe they do now.

Maybe it was just like a time issue.

Given that other Olympians were using the same pool.

I understand the concern, but I'm very confident that there's no recorded instances of HIV being transferred or transmitted in the midst of a pool.

The virus doesn't survive really outside the body in this way.

Chlorine would kill it immediately.

So I don't think that that is something people need to be concerned with.

This is actually pretty similar to a question that I asked my nephew when I gave him a sex ed quiz about whether or not sperm dies in a hot tub.

Click here to check that out.

And as always, stay happy and healthy.