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Hall shared a post on Instagram showing off his impressive weight loss, with a photo on the left showing what he looked like in 2017, while a second snap showed what he looks like now.
He wrote in the caption: "Left ️- 2017 @ 196kg / 432lbs. Right - 2021 @ 161kg / 355lbs.
"3 years difference and 36kg [5.7st] lost!"
Hall won the World's Strongest Man competition back in 2017 after beating defending champion Brian Shaw.
More recently, however, he's been focusing on getting himself into shape as he prepares to fight Game of Thrones' Hafþór Björnsson next September, having been documenting his health kick on social media and YouTube.
Last September, Hall revealed he'd been keeping an eye on his fitness and nutrition to ensure he's in best shape for the big day, chowing down on 7,000 calories a day - almost three times the recommended intake for an adult male.
He said his six daily meals included food like chicken, rice, vegetables, chocolate, granola, baked potatoes and coleslaw, along with a few snacks to keep him going.
"Because of my size and the intensity of my training programme, I have to eat a lot," he explained.
"I currently consume about 7,000 calories a day, containing a variety of protein, carbs and vegetables.
"It's not only time consuming to eat so much, it also takes a lot of forward planning, consistency, and effort."
As for working out, Hall said he'd been pushing himself with gruelling daily cardio, swimming and High Intensity Interval Training (HIIT) sessions.
He's also been learning the art of boxing, which is apparently 'whole new ballgame' for Hall, who said the sport 'requires a different kind of fitness and endurance to Strongman'.
He continued: "It's important I keep up my energy levels and focus and that my muscles recover quickly, which supplements can really help with.
"Due to my size and the level at which I'm training, I also need to take more vitamins and supplements than the average person - so it was crucial I found a more effective and convenient solution than popping loads of pills each day."
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