ZACK George was once a self-conscious schoolkid who scoffed a McDonald's a day.
Now, he's a ripped Gladiator star named Steel who works out for 24 hours every week.
How did he do it? And just how does he maintain his "superhuman" strength and muscular physique?
We did some digging to find out.
The old Zack
Zack, from Leicester, was overweight and addicted to fast food as a child.
"I practically inhaled chocolate and ate McDonald's and KFC — a family bucket — five times a week," he said.
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"The more fast food I ate, the more I craved it. It was a vicious cycle.
"I used to try to skip swimming lessons because I was so self-conscious of how I looked and didn’t take my top off.
"Being overweight makes you feel rubbish. You can't walk or run far so you don't want to exercise and you often end up finding comfort in fast food."
Noticing his son was unhappy, Zack's dad offered to buy him a PlayStation if he made an effort to lose some weight.
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He threw himself into fitness and eating well, and the rest is history.
"Without saying it, [my family] came on a journey with me," he said.
"We all cleaned up our diets - we didn't have chocolate or sweets in the house."
The new Zack
Once Zack, from Birstall, West Yorkshire, caught the exercise bug, he couldn't shake it.
He represented Leicestershire as a county athlete in rugby, squash and table tennis before entering the CrossFit Games - an annual athletic competition.
In 2015, he opened his own gym and he qualified for the European CrossFit Regionals in 2018.
He placed first at the UK CrossFit Open 2020 - the same year he was crowned the UK's Fittest Man.
Now, he competes as Steel on the second revival of Gladiators on BBC One, presented by Bradley Walsh.
Zack trains for four hours a day, six days a week - and has done for the last 10 years.
"I was inspired by the Gladiators as a child, but never imagined I'd be physically fit enough to be considered a 'superhuman'," he said.
"It’s crazy looking back because when I was younger and overweight, I used to watch Gladiators and draw a pretend six pack on my stomach, because I could never think about ever having abs.
"I hope a new generation of fans will look up to me as their new strong, unbreakable hero, Steel."
In the gym
If it wasn't already clear by looking at him and watching him in action, Zack spends a lot of time in the gym.
According to videos posted on Instagram, his favourite exercises are ones involving kettlebells and pull-ups on a bar or rings.
But overall, he's a CrossFit fanatic.
CrossFit is a form of high-intensity interval training made up of functional strength and condition movements.
This means squatting, pulling, pushing and lifting - and lots of it.
Zack's regime includes:
- Kettlebell snatches
- Explosive GHD sit-ups
- Ring dips
- Strict pull-ups
- Ring muscle-ups
- Handstands - on the ground and a ramp
- Static bike cycling
- Rowing machine
- Wall balls
- Running on a track and curved treadmill (15 x 400m with a one-minute rest between sets)
- Sandbag lifts
- Dead lifts
- Hang cleans
- Front squats
- SkiErg machine
- Skipping
He's also a big fan of something called Mikko's Triangle - a brutal-sounding 40-minute circuit. It involves:
- First minute - 23 calories on the assault bike
- Second minute - 23 calories on the rowing machine
- Third minute - 23 calories on the SkiErg
- Fourth minute - rest
And he doesn't stop training on holiday.
While in Portugal last summer, he was doing five burpees, 10 push ups and 15 squats repeatedly on his balcony in 35C heat.
But it's not all about getting your heart rate up and dripping in sweat.
Zack, who is 6ft and weighs 223lbs, even does yoga.
He can hold the crow pose (where you rest your knees on your upper arms and lift your bum in the air) for a staggering one minute and 32 seconds.
Overall, his training is split into 40 per cent fitness, 40 per cent gymnastics, and 20 per cent strength.
This usually involves a couple of hours of cardio in the morning and weights in the afternoon.
But on Wednesdays, he also goes swimming.
And before and after every workout, he does plenty of stretching and mobility exercises, he said.
Zack George in numbers
- Age: 33
- Height: 6ft
- Weight: 223lbs (101kg)
- Daily calorie intake: 4,000
- CrossFit ranking: 25th out of 126,461
- Barbell snatch: 127.5kg
- Back squat sits: 210kg
- Handstand push-ups: 41
- Cleans: 140kg
- 5k run: 19 minutes 16 seconds
- One-mile run: five minutes 25 seconds
Recovery & motivation
When he's training hard, Zack has ice baths to "aid recovery".
Plunging into cold water is said to improve alertness, reduce pain and decrease inflammation.
The athlete also uses special mental techniques to help keep himself motivated.
His secret, he says, is to "visualise me winning any game I'm about to play".
Zack also pictures his idols, runner Usain Bolt and former basketballer Michael Jordan, as well as his parents.
In the kitchen
If you work out as hard as Zack does, you've got to make sure there's enough fuel in the tank.
For him, this means consuming a whopping 4,000 calories a day.
"I've found this is the minimum amount for me to perform well while keeping my weight in check," he told .
The recommended daily calorie intake for men in the UK is 2,500, but the amount of energy you need depends hugely on your age, lifestyle and size.
A typical breakfast for Zack is porridge with a scoop of protein powder.
Lunch usually consists of two salmon fillets with vegetables and rice, and dinner is either red meat or white fish with more vegetables and rice or sweet potatoes.
Throughout the day, he will have porridge as a snack, and whey protein after he trains.
To supplement it all, he also takes creatine, multivitamins, omega-3 and zinc.
He follows this strict diet throughout the week, but lets himself relax a little at the weekend.
While he "hasn't eaten fast food in 10 years", he loves a doughnut.
"My guilty pleasure is doughnuts," he said in an Instagram interview.
"I love them. Just the plain glazed ones."
Zack appears to have partnerships with My Protein, Nocco and Fresh Fitness Foods.
Earlier this month, he shared a photo of himself tucking in to a high-protein chocolate chip Baked Cookie, and in January, he posed with a can of of Blood Orange Nocco - a fizzy drink containing 180mg of caffeine, vitamins B6 and 12, and BCAAs, said to increase muscle mass and strength while training.
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Late last year, he said Fresh Fitness Food "made nutrition easy".
The meal-prep delivery brand is known for its personalised healthy dishes.
Zack George's beginner strength workout
- Bench press
- Pull ups
- Front squats
- Dead lifts
Complete six sets of three reps of each movement, with 90 seconds rest between sets.
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