May 12, 2026, 3:42 pm | Read time: 5 minutes
Whether as Éomer in “The Lord of the Rings,” the uncompromising Billy Butcher in “The Boys,” or Johnny Cage in “Mortal Kombat II”–Karl Urban (53) has been one of Hollywood’s most consistent action stars for over two decades. Notably, the New Zealander has continually adapted his training style to meet the demands of his roles. FITBOOK reveals how his journey through various workouts has unfolded.
Action roles today demand significantly more physicality from actors than they did 20 years ago. In addition to strength and endurance, flexibility, coordination, and quick recovery are now crucial. Karl Urban is an example of an actor who has never trained his body solely for muscle aesthetics–but primarily for functionality. From classic stunt and horseback training to functional athletics and intense martial arts sessions, the 53-year-old’s career exemplifies how modern acting training, especially in the action genre, has evolved.
Action Training Before the Fitness Boom
When Karl Urban made his breakthrough with “The Lord of the Rings” in the early 2000s, training for action actors looked different than it does today. For his role as Éomer, he primarily had to prepare for the physical demands on set. This meant learning horseback riding and handling a sword and lance. At that time, an extremely toned body was less crucial; instead, a believable portrayal of a fighter was more important, so his training primarily included fight choreography, endurance work, and weapons training.
Even in later films like “The Bourne Supremacy” (2004) or “Doom” (2005), his preparation mainly consisted of practical action. What was needed were resilience, flexibility, and clean stunt work–less so a perfect bodybuilder look.
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Strong Without Superhero Physique
With films like “Dredd,” released in 2012, Karl Urban entered a visibly more athletic phase. His body appeared more compact and robust, without adopting the extremely defined Marvel look of many superhero actors. This suited his role profile: Karl Urban often played edgy antiheroes who had little to do with high gloss. His focus was less on maximum muscle mass and more on performance.
During the filming of the series “The Boys,” which began in 2019, it became clear how physically demanding modern productions can be. The training included action sequences, night shoots, and constant repetitions of individual scenes. “I put together a program based on some other training plans I had developed for other film projects–and it worked,” Urban told “Men’s Journal.” “The goal was to build mass in all muscle groups and train them all. I wanted something that was as much about fitness as it was about aesthetics.”
For this, he particularly trained his legs as the largest muscle group and his upper body with a focus on back and chest. “It rounds out the silhouette,” he emphasized. He set up his own gym with a Smith machine, leg press, a free weight rack, and a treadmill. “The program I completed for Billy Butcher included a lot of leg presses, squats, sled pulls, seated rowing, and lat pulldowns,” the actor explained in the interview.
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How Johnny Cage Even Pushed Karl Urban to His Limits
The training became even tougher for his role as Johnny Cage in “Mortal Kombat II”–the second adaptation of the video game classic hit theaters this May. “I trained almost daily in the gym for three to four months, with strength and endurance training, but also with martial arts sessions with my teacher. They brought me back to the basics,” Karl Urban revealed to the U.S. magazine “Men’s Health.”
“I had to learn the basics of movement, agility, and coordination. We did the same speed training that I know from Novak Djokovic when he warms up for a tennis match. It was intense.” The preparation was even the most physically demanding of his entire career: “It was undoubtedly the most challenging project I have ever undertaken for a film,” the actor noted afterward.
A Different Kind of Action Hero
Unlike many of his famous colleagues, Karl Urban is not known for spectacular body transformations or extreme crash diets. His training almost always aligns with the function of the role. Whether it’s horseback training for “The Lord of the Rings,” tactical action for “Dredd,” or martial arts for “Mortal Kombat II,” the father of two adapts his body to the demands of each character. This makes him one of the most versatile action actors of his generation.
His impressive career also shows that credible fitness doesn’t necessarily mean extreme muscle mass. Often, our favorite actors appear particularly convincing when their athleticism is functional and realistic. And perhaps that’s the most important takeaway from Karl Urban’s training: Sustainable athleticism beats short-term extreme forms–especially when you want to play believable action heroes even at over 50.