“The Hills” alum reveals what he did to celebrate passing the “world’s toughest test.”

But he tells EW that instead of celebrating, he found himself recovering.

“I was in rough shape after.

Brody Jenner on ‘Special Forces: World’s Toughest Test’

Brody Jenner on ‘Special Forces: World’s Toughest Test’.Credit:Pete Dadds/FOX

I lost a bunch of weight.

And it’s a rough experience to put your body through, for sure.”

“I mean, that water, when you walked by it … you could smell that water.

Brody Jenner

Brody Jenner.Paul Archuleta/Getty

It was disgusting.”

Paul Archuleta/Getty

He didn’t react well physically.

“I woke up, my eyes were sealed shut.

“So all of a sudden I came down [with something], but I didn’t complain.

I banged it out, and luckily it didn’t move into my lungs until after I left.

So it was really in my sinuses and in my face, and I just got through it.

And then when I left, my body was really able to just get sick.

I think the adrenaline and wanting to make it to the end kind of suppressed the sickness.”

“We still talk.

We have a group chat.

It’s a side of the younger Jenner that viewers don’t always see.

“When I signed up, I had watched the previous seasons.

“And to be honest, you’re in a very vulnerable state…. You’re not sleeping.

You’re getting so physically exhausted.

You’re kind of out of it.

It is just things come out without you even knowing.”

For him,Special Forcesdoesn’t compare to any other reality show.

“They call it the world’s toughest test for a reason,” Jenner says.

I mean, there’s no prize at the end.