As a former professional rugby player and Hyrox athlete, Pete Laverick knows what elite physical conditioning takes. But as Matt Damon debuts a lean, battle-tested physique for Christopher Nolan's 'The Odyssey', he takes a closer look at what Hollywood actor body transformations really cost—and why the headlines rarely tell the full story
Matt Damon is 55. He plays a battle-hardened Greek king in Christopher Nolan's The Odyssey, out now, and he looks it—properly, convincingly built, not the softened middle-age version of muscular we usually get sold. Nolan told him he wanted "lean but strong." Damon delivered: down from his usual 185–200lbs to 167lbs, his lightest since high school, through months of deadlifts, pull-ups and interval training, plus a doctor-ordered switch off gluten. It's a genuinely impressive transformation. It's also, by the standards of Hollywood actor body transformations, one of the more sensible ones.
I've spent years around elite endurance and hybrid athletes—training alongside them, MCing their races, occasionally suffering through their programming myself—and there's a category error we keep making with these stories. We read "actor gets shredded for role" and file it next to New Year's resolutions and gym-selfie inspiration, as though it belongs in the same conversation as a normal person deciding to get fitter. It doesn't. For the months these actors spend preparing, getting in shape is their full-time job, backed by a trainer, a nutritionist, sometimes a physiotherapist and a production budget behind all three. Comparing that to squeezing in a run before the school pickup is roughly as fair as comparing your Sunday 5K to an Olympic marathoner's splits.
The athletic approach: how Matt Damon and Brad Pitt built functional physiques
Brad Pitt understood the assignment when he trained for Troy. Reaching for Achilles, he spent close to six months working with Duffy Gaver, a former Navy SEAL, deliberately avoiding the oversized, gym-built look in favour of something modelled on Greek statuary and Greco-Roman wrestlers—proportion over mass, movement over size. It's the reason that physique still gets referenced two decades later. It wasn't a shortcut. It was a slow, engineered build, treated with the same seriousness a professional athlete brings to an off-season.
Damon's Odyssey prep sits in that same camp: deliberate, monitored, built over time, with a level of discipline most of us would struggle to sustain for a fortnight, let alone a shoot.
Read more: 'The Odyssey': 5 differences between Homer's poem and Christopher Nolan's movie
Above Achilles (Brad Pitt) gets his revenge on Hector (Eric Bana) for the death of Patroclus outside the walls of Troy, originally released in 2004. Pitt worked with a Navy SEAL to develop his physique
When transformations become medical risks: dehydration and extreme starvation
Then there's the other end of the spectrum, where "transformation" starts looking less like athletic preparation and more like a controlled medical risk.
Hugh Jackman has talked openly about what it took to get Wolverine-shredded for his shirtless scenes, in Logan and again in Deadpool & Wolverine: drinking close to three gallons of water a day for weeks beforehand, then cutting off entirely for the 36 hours before filming. The body, still flushing out water on autopilot, sheds close to 10lbs almost overnight. Jackman has been upfront that this is dangerous, and has said as much to anyone who'll ask—Stephen Colbert once pointed out on air that three days without water can kill you, and Jackman was getting uncomfortably close to that line for the sake of a six-pack under studio lighting.
Above Watch: Hugh Jackman details the dangerous 10-pound water-cut regimen he undergoes before filming shirtless scenes on 'The Late Show with Stephen Colbert'.
Christian Bale went further still for The Machinist, dropping somewhere north of 60lbs to land around 120lbs, on a diet reported to be little more than an apple, a can of tuna and black coffee a day. He reportedly wanted to lose more. Producers and doctors stepped in before he could. Bale got an extraordinary performance out of it. He also, by his own account, pushed his body somewhere it had no business going.
Read more: Are ice baths, saunas and cold therapy the best solution to post-workout recovery?
The myth of the 2:30 am routine: why even relentless regimens burn out

Above Mark Wahlberg putting in work during an F45 training session. Beyond getting built for specific movie roles, Wahlberg's functional training regimen and early-morning routine have made his personal fitness agenda legendary.(Photo: Phillip Faraone/Getty Images for F45 Training)
Mark Wahlberg sits in the middle, and his story might be the most honest of the lot. His viral 2:30am wake-up, double-workout, ice-bath-laden routine became a kind of internet legend in 2018—the ultimate "no excuses" content. He's since dialled it back to a marginally saner 3:30–4am start, with more sleep and more recovery built in—because even Mark Wahlberg, it turns out, couldn't run that engine indefinitely. Even the guy who built a brand of relentlessness eventually needed to rest, if you can call waking up at 4am getting a rest.
Hollywood vs. reality: why you shouldn't copy an actor's workout plan
None of this means Hollywood is lying to you, exactly. It means the headline "actor gets ripped for role" is doing a lot of flattening—collapsing six months of professional, well-supervised strength work and 36 hours of medically inadvisable dehydration into the same tidy, aspirational story. One of those is closer to what an elite athlete does in an off-season block. The other is closer to a stunt.
It's also worth remembering that none of these transformations were built to last. Once filming wraps, the diet ends, the trainer moves on to the next job, and most of these actors quietly drift back toward whatever their body looks like when nobody's paying them to look a certain way.
That's not a criticism—it's just what a short-term, role-specific goal is supposed to do. If something in this piece has you eyeing a similarly aggressive goal of your own, the more useful question isn't which actor's routine to copy, but who around you can actually assess whether it's sensible: a doctor if you're changing your diet drastically, a physiotherapist if you're pushing load or intensity you're not used to, a trainer who knows your history rather than a stranger's Instagram routine. The transformation is the easy part to admire. Knowing when to stop, and who to ask before you start, is the part that doesn't make the highlight reel.
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