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Marvel Studios assembled the largest ensemble in its history for Avengers: Doomsday, unveiling 27 cast members during a five-hour livestream on March 26, 2025, then adding more names through principal photography at Pinewood Studios in the UK. The Russo brothers’ film now lands in theaters on December 18, 2026 after shifting from its original May 2026 slot, which means the promotional machine is running at full speed — and so are the actors’ training programs.
What makes this particular cast list fascinating from a fitness standpoint is the sheer range. You have Chris Hemsworth, who has spent 15 years operating at the far edge of what a natural physique can look like on camera. You have Ian McKellen and Patrick Stewart, both in their mid-eighties, returning to roles they originated in 2000. You have Channing Tatum finally suiting up as Gambit after a decade of false starts, and Robert Downey Jr. rebuilding his entire screen presence as Victor Von Doom rather than Tony Stark.
Below is a breakdown of the most significant body transformations across the Doomsday roster — the diets, the trainers, the injuries, and the numbers behind them.
Quick Comparison Table
| Actor | Role | Height | Approx. Weight |
|---|---|---|---|
| Chris Hemsworth | Thor | 6 ft 3 in (191 cm) | ~220 lbs (100 kg) |
| Robert Downey Jr. | Doctor Doom | 5 ft 8 in (174 cm) | ~172 lbs (78 kg) |
| Channing Tatum | Gambit | 6 ft 1 in (185 cm) | ~185 lbs (84 kg) |
| Anthony Mackie | Captain America | 5 ft 11 in (180 cm) | ~180 lbs (82 kg) |
| Sebastian Stan | Bucky Barnes | 6 ft 0 in (183 cm) | ~180 lbs (82 kg) |
| David Harbour | Red Guardian | 6 ft 3 in (191 cm) | ~220 lbs (100 kg) |
| Florence Pugh | Yelena Belova | 5 ft 4 in (163 cm) | ~121 lbs (55 kg) |
| Simu Liu | Shang-Chi | 5 ft 10 in (178 cm) | ~165 lbs (75 kg) |
| Winston Duke | M’Baku | 6 ft 5 in (196 cm) | ~245 lbs (111 kg) |
| Pedro Pascal | Reed Richards | 5 ft 11 in (180 cm) | ~172 lbs (78 kg) |
Quick Summary: Robert Downey Jr. is an American actor born April 4, 1965, who stands 5 ft 8½ in (174 cm) tall and weighs about 78 kg (172 lbs). Best known as Tony Stark/Iron Man in the Marvel Cinematic Universe and an Oscar winner for Oppenheimer (2024), he holds an estimated net worth of around $300 million.
Last updated: September 13, 2026
1. Chris Hemsworth
Chris Hemsworth remains the benchmark. At 6 ft 3 in and 220 pounds, the Australian has worked with trainer Luke Zocchi since before the first Thor in 2011. For Thor: Love and Thunder (2022) he hit his heaviest on-screen condition, eating 4,000–4,500 calories daily across as many as ten feedings to support twice-daily sessions.
His approach has shifted since. After testing for the National Geographic series Limitless revealed he carries two copies of the APOE4 gene variant, Hemsworth recalibrated toward longevity — more mobility and recovery work, sauna and cold exposure protocols, less chronic bulking. His Centr app programming reflects that: shorter, higher-density sessions, five to six training days rather than seven. For Doomsday, expect a leaner, more functional Thor than the 2022 version.
2. Robert Downey Jr.
Robert Downey Jr. turned 60 in April 2025 and is playing a villain who spends most of his screen time in armor — which changes the brief entirely. Standing 5 ft 8 in, Downey has trained Wing Chun for over two decades under instructor Eric Oram, a fight consultant on the Sherlock Holmes films and several MCU entries.
His conditioning philosophy is martial-arts-first: footwork, chi sao drills, and mobility over heavy barbell work, supplemented by kettlebells circuits and a largely clean, low-sugar diet he adopted during his post-2003 recovery. For Doctor Doom, the priority is posture, presence, and moving convincingly in a heavy practical costume for 12-hour shooting days.
3. Channing Tatum
After a decade of development hell on a standalone Gambit film, Channing Tatum finally debuted the role in Deadpool & Wolverine (2024) and carries it into Doomsday. At 6 ft 1 in and around 185 pounds, Tatum built his frame on a wrestling and football background before his dance career.
His most documented transformation came for Magic Mike’s Last Dance (2023), a regimen he called miserable — high-volume resistance training paired with a severely restricted, low-carb diet to hold single-digit body fat through months of shirtless shooting. Tatum has been open that he does not maintain that condition year-round, calling it “not natural” and cycling back to a heavier playing weight between projects.
4. Anthony Mackie
Anthony Mackie inherited the shield in Captain America: Brave New World (2025) and treated the promotion as a mandate to rebuild. At 5 ft 11 in and 180 pounds, Mackie has said he trained harder for that film than for any of his six previous MCU appearances, adding upper-body mass to sell the silhouette of a man without a super-soldier serum.
His programming leans on compound lifts, high-rep bodyweight circuits, and boxing conditioning — a necessity given that Sam Wilson’s choreography depends on wingsuit acrobatics and wire work rather than brute strength. Mackie has credited stunt rehearsals as the bulk of his real cardio.
5. Sebastian Stan
Sebastian Stan is 6 ft 0 in and has held 180 pounds across his Winter Soldier appearances, training with Don Saladino — the New York coach behind Ryan Reynolds’ and Hugh Jackman’s superhero conditioning. Saladino’s template emphasized shoulder and back development to fill out the tactical costume, with sessions built around loaded carries, pull-ups, and Turkish get-ups.
Stan has proven willing to move in the other direction too. He dropped significant weight for A Different Man (2024), which earned him a Golden Globe, and altered his build again for The Apprentice. That range makes his Bucky physique a deliberate rebuild each time rather than a maintained baseline.
6. David Harbour
No one on this cast has swung between extremes like David Harbour. The 6 ft 3 in actor bulked to 250 pounds for Hellboy (2019) under Don Saladino, then lost a reported 75 pounds for the Russian prison arc of Stranger Things season four via intermittent fasting and sharply reduced calories.
He then reversed course for Alexei Shostakov in Black Widow and Thunderbolts* (2025), where the joke is a powerlifter’s build gone soft. Harbour has spoken candidly about the toll of that cycling, describing the weight loss as physically brutal and the regain as its own challenge.
7. Florence Pugh
Florence Pugh is 5 ft 4 in and 121 pounds — the smallest frame on this list and arguably the most physically committed performer. For the opening of Thunderbolts*, Pugh personally leapt from the roof of Merdeka 118 in Kuala Lumpur, the world’s second-tallest building, rather than hand the shot to a double.
Her prep for Yelena centers on gymnastics-style bodyweight strength, grip work, and combat choreography rather than hypertrophy. Pugh has been vocal about rejecting pressure to shrink for roles, and her training is structured around what the stunts demand.
8. Simu Liu
Simu Liu, 5 ft 10 in and around 165 pounds, came to Marvel with an unusual résumé: he worked as a stunt performer on Pacific Rim: Uprising before booking Shang-Chi and the Legend of the Ten Rings (2021). For that film he trained four hours a day for several months, splitting time between wushu, Muay Thai, Brazilian jiu-jitsu, and weight work.
Liu ate six meals a day during that build and has continued CrossFit-style conditioning since. His is a martial-arts physique — lean, mobile, built for on-camera speed rather than raw size.
9. Winston Duke
At 6 ft 5 in, Winston Duke is the tallest man in the ensemble. He put on significant mass for M’Baku in Black Panther (2018), pushing toward 250 pounds through heavy compound lifting and a high-protein surplus, and maintained that frame through Wakanda Forever (2022).
Duke has discussed the mental side openly, noting that carrying a Hollywood “big man” physique came with its own body-image pressures. His training blends powerlifting fundamentals with the Wakandan fight style, which relies on grappling and overhead strength.
10. Pedro Pascal
Pedro Pascal, 5 ft 11 in, joined the MCU as Reed Richards in The Fantastic Four: First Steps (2025) at age 50, following a demanding stretch that included Gladiator II and The Last of Us. His conditioning is pragmatic rather than aesthetic — resistance training for durability across back-to-back shoots, plus the sword and combat prep Gladiator II required.
Pascal has been unglamorous about it, describing the gym as a job requirement rather than a passion. For a character defined by intelligence rather than physicality, that restraint fits.
11. Rebecca Romijn
Rebecca Romijn returns as Mystique, a role whose demands were never about the gym. The 5 ft 11 in former model endured eight-to-nine-hour body paint applications for X-Men (2000), trimmed to four hours by X2 as the prosthetic team refined its technique. She spent those shoots essentially nude under silicone appliances, requiring genuine core and postural endurance.
Romijn, now 52, has maintained her frame through yoga, Pilates, and hiking, and has spoken about how motherhood reshaped her relationship with her body after two decades in fashion.
Conclusion
What emerges from the Doomsday roster is a shift in how Marvel bodies are built. The 2012-era approach — dehydrate, peak, shoot shirtless — has largely given way to sustainable programming, with Hemsworth’s longevity pivot and Pugh’s stunt-first conditioning setting the tone. With filming continuing into 2026 ahead of the December release, expect more training footage as the press cycle intensifies.
Frequently Asked Questions
How tall is Robert Downey Jr.?
Robert Downey Jr. is 5 ft 8½ in (174 cm) tall. That places him just under the average height for an American man.
How much does Robert Downey Jr. weigh?
Robert Downey Jr. weighs approximately 78 kg (172 lbs). His weight has fluctuated by several pounds for roles such as Tony Stark and Sherlock Holmes.
How old is Robert Downey Jr.?
Robert Downey Jr. was born on April 4, 1965, in Manhattan, New York City, which makes him 60 years old in 2026.
What is Robert Downey Jr.’s net worth?
Robert Downey Jr.’s net worth is estimated at around $300 million, built largely on his Marvel backend deals as Iron Man.
Is Robert Downey Jr. married?
Yes. He has been married to producer Susan Downey since 2005, and the couple have two children together, Exton and Avri.
What is Robert Downey Jr. best known for?
He is best known as Tony Stark/Iron Man in the Marvel Cinematic Universe and as Sherlock Holmes. He won the Best Supporting Actor Oscar in 2024 for Oppenheimer.
How did Robert Downey Jr. get in shape for Iron Man?
He trained with Wing Chun kung fu, weight training and circuit work five days a week, paired with a lean, high-protein, low-sugar diet to build the Tony Stark physique.
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Last Updated: October 25, 2026 | Source: Healthy Celeb
