Hello and welcome to SciShow Tangents, the lightly competitive science knowledge showcase.

I'm your host Hank Green, and joining us this week, as always, is Science Expert,

Barry Riley. Hello. And we have fellow science experts, Deboki Chaukravarti, and Sam Jones.

It's just an all science episode today on SciShow Tangents. Now every person, we've got a

bunch of extra PhDs here today, way more than usual, infinitely more. These are the hosts

of the podcast Tiny Matters, which I have been on and love. So recently, I, right now I'm

getting radiation treatment for my cancer. And before doing that yesterday, I decided to go

do my very first CrossFit class. And that's how I know I'm an idiot. CrossFit normally is

already bad news. I'm really curious about the steps that led to that. So like, there's a CrossFit

base. Okay. It's very close to my house. All the other gyms would require that I get in a car,

but not this one. And so I thought maybe that would be the way to go. And honestly, it was like,

I think, for CrossFit, pretty chill. Like there was a sign on the wall that said, do the

fucking work. But none of the people were like the sign. That is a hard launch back into exercise.

We've all been idiots at one time in our life. Speak for yourself.

I've only ever been a genius. I have any of us ever had, I know that this is this crowd,

but like a fitness goal that we went for. Ron, I know the series done some running. Yeah.

I've done some running. Yeah, I have run to the point where my body collapsed, which was,

I did the dopey challenge, which it's right there in the name. It is run by Walt Disney World.

Yeah, and it's a bunch of idiots that do it together. I did it with our friend Nicole Swini.

And you run a 5K one day and then a 10K the next day and then a half marathon the following day

and then a full marathon the following day. So all four days in a row, you just keep pushing your

body to further and further distances. And after the last day, after I finished, I just started

...