The weight loss has been built into his character’s storyline as Craig tries to get fit in order to join the police.
In recent scenes he’s been taking up running and even convinced unlikely friend David Platt to join him in order to help with his mental health.
However, in real life, Colson Smith has also been running as well as doing weights to drop the pounds.
The soap actor has been posting selfies on Instagram each time he goes for a run, showing off his much slimmer physique.
Speaking on the Lorraine show earlier this year to discuss his Corrie character and lockdown, he revealed that he was also getting his food delivered – a plan devised with life coach Rob Brennan.
“We worked through everything I could do to make it as easy as possible,” Colson said.
“So I have my breakfast and lunches delivered, and they’re still being delivered now, which means cooking I don’t have to think about, I can just eat.
“And in terms of the gym, I’ve kind of kept in touch with the gym I’ve been going to in Manchester because they’re putting on lots of training programmes on their app. I’ve done the odd Joe Wicks PE, and then it’s just making the most out of the situation.”
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He’s also used rowing, heavy weights and kettle bells in order to get in shape.
However, he’s also admitted that he originally lost a stone and a half due to food poisoning after eating some bad seafood in Thailand in December last year.
Fans have been stunned by his transformation, with viewers sharing their thoughts on social media following the latest episode.
One viewer wrote: “Craig has done amazing with his weight loss during lockdown, looking fit.”
Another tweeted: “Blimey Craig is half the man he used to be I hardly recognised him he’s lost so much weight.”
The star also joked on Twitter that he may need to be replaced on the show given how different he looks.
He tweeted the word “Recast” last night, with soap fans quickly getting the joke as they praised his healthier weight.
He also shared a throwback snap of when he first joined the cobbles.
“Nine years of Craig Tinker,” he wrote, with a picture of his younger self playing the well-loved character.