How do you prepare for the (then) biggest fight of your professional career? Well, if your Conor McGregor, training with a 400 lbs strongman competitor.

When Hafthor Julius Bjornsson stepped foot inside Straight Blast Gym in Dublin, Ireland, no one expected a video to go viral with their star pupil.

But after McGregor asked for a photo reminiscent of the iconic picture of Bruce Lee and NBA legend Kareem Adbul-Jabar, a sparring match ensued.

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The picture McGregor was hoping to recreate.

"Let's take a cool picture like that," McGregor said via MMA Fighting. "We squared off as if we were gonna do it. Then all of a sudden, he's bouncing and I'm bouncing. Next thing you know, we're having a full, bare-knuckle body shot fight."

(Watch McGregor spar with The Mountain at his Dublin base:)

Credit: The Mac Life

Speaking about the spar which pitted a 150-lbs fighter (leading up to his title fight with Jose Aldo at UFC 194) against a 6-foot-9, 400-pound strongman, the Irishman detailed the competitive exchange.

"I was hitting him with some shots. I had to hit him with some shots. He was trying to hit me as well. He wasn't taking it easy."

"He tried to grab me and tried to pull my head off. I defended, freed the head. I was like this motherf*cker is so big, I have to start smashing him to the body."

McGregor is no stranger to fighting against bigger opponents following his two fights with Nate Diaz at welterweight - a career heavy after competing at featherweight and lightweight.

And while he had fun, in typical McGregor fashion he claimed victory, "It was a lot of fun, that's a big man - 6-foot-9, 400 pounds. And I still folded him up."

Meanwhile, from one mega-fight to another - McGregor has officially signed a contract to box Floyd Mayweather. The next step is for Dana White to negotiate a deal with the Mayweather as the boxing bout looms.

Nasir Jabbar

Nasir Jabbar is a writer at SPORTbible. He is a combat sport aficionado and contributes to boxing and MMA articles.

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