Mark Wahlberg shows off 6-month body transformation — and fans are stunned: 'Unbelievable'

Hard work really does pay off.

Actor Mark Wahlberg shared a photo on Instagram on Thursday, giving fans a look at his even-more-ripped-than-before body.

In the caption, Wahlberg, 48, explained that he's been training hard and eating healthy to get to where he is now.

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"Six months of Performance Inspired Nutrition, Aquahydrate, and F45 training!!" the caption reads. "Clean eating. Inspired to be better, team training / life changing."

Fans immediately took to the comments section to commend the star.

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"Unbelievable, love ur [sic] dedication and hard work," wrote one social media user. "Lookin good," said another person. Several celebs couldn't also help but comment with "Jersey Shore" star Mike "The Situation" Sorrentino writing: "We got a Situation" and Mario Lopez simply stating: "BEAST!"

Over the last few weeks, Walhberg has frequently posted about F45 training, the program he's been participating in.

In one video, the action star can be seen in a cardio class that included core exercises.

"Please watch Rasta Phil at the end of this video," the caption says. "Look at how F45 makes him feel."

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Wahlberg has even gotten his son in on the fun.

"My little guy joining the program," said the caption of the video, which showcased Brendan Wahlberg doing a pull-up.

Just one day later, Wahlberg shared a video of Brendan doing five pull-ups -- with a little help from dad.

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"Team training life changing @f45_training PI nutrition! @prezpat_," read the caption.