Hollywood hunk Mark Wahlberg has always been in shape, ever since his days modelling Calvin Klein underwear back in the 1990s.
But the 48-year-old has just revealed the results of a gruelling six month fitness transformation on Instagram, which has sent his 13.9million followers into a frenzy.
The New Kids on the Block star posed shirtless for the photo, tensing his muscular arms and rippling abs, while wearing some dark jeans low on his waist.
The dad-of-four captioned the post: "Six months of performance inspired nutrition, aquahydrate and F45 training! Clean eating. Inspired to be better, team training, life changing."
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The snap racked up a whopping 964,000 likes, while plenty of his followers left comments too.
One joked: "I think I can take him."
Another wrote: "Freakin' Wahlberg! Making us all look bad! Dammit. Now I gotta put the pastrami sandwich down and go to the gym. Dammit Wahlberg."
A third commented: "I think it's time he does another Calvin Klein photo shoot."
Someone else said: "This dude has been in shape his whole life and at his age still looks in shape."
While a fifth added: "I think I just became pregnant again."
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Mark previously shared a look at his daily schedule, which started with a 2:30am wake up call.
He had two work outs a day – one between 3:40am and 5:15am, and another at 4pm.
The actor ate seven times a day and went to bed at 7:30pm, according to his schedule.
And we thought a 7am wake up call was difficult enough.
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